Quarterly report pursuant to Section 13 or 15(d)

Redeemable Noncontrolling Interests and Equity - Schedule of Changes in Redeemable Noncontrolling Interest,Total Stockholders' Equity and Noncontrolling Interests (Details)

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Redeemable Noncontrolling Interests and Equity - Schedule of Changes in Redeemable Noncontrolling Interest,Total Stockholders' Equity and Noncontrolling Interests (Details)
$ in Thousands
9 Months Ended
Sep. 30, 2018
USD ($)
fund
Sep. 30, 2017
USD ($)
Dec. 31, 2017
fund
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]      
Balance at beginning of period $ 123,801    
Balance at end of period 117,468    
Balance at beginning of period 1,240,516 $ 995,728  
Cumulative effect of adoption of ASU 2016-16 and ASU 2016-09   2,996  
Exercise of stock options 13,860 1,573  
Issuance of restricted stock units, net of tax withholdings (7,910) (2,925)  
Shares issued in connection with the Employee Stock Purchase Plan 1,755 1,145  
Stock based compensation 21,991 16,530  
Contributions from noncontrolling interests and redeemable noncontrolling interests 187,021 368,902  
Distributions to noncontrolling interests and redeemable noncontrolling interests (44,362) (31,098)  
Net income (loss) (151,823) (173,638)  
Other comprehensive loss, net of taxes 22,969 (3,974)  
Balance at end of period $ 1,284,017 1,175,239  
Number of funds, carrying value adjusted to redemption value | fund 5   5
Redeemable Noncontrolling Interests      
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]      
Balance at beginning of period $ 123,801 140,996  
Contributions from redeemable noncontrolling interests 60,683 105,167  
Distributions to redeemable noncontrolling interests (8,168) (11,794)  
Net income (loss) (58,848) (57,942)  
Balance at end of period 117,468 176,427  
Total Stockholders' Equity      
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]      
Balance at beginning of period 881,582 742,771  
Cumulative effect of adoption of ASU 2016-16 and ASU 2016-09   2,996  
Exercise of stock options 13,860 1,573  
Issuance of restricted stock units, net of tax withholdings (7,910) (2,925)  
Shares issued in connection with the Employee Stock Purchase Plan 1,755 1,145  
Stock based compensation 21,991 16,530  
Net income (loss) 32,545 56,235  
Other comprehensive loss, net of taxes 22,969 (3,974)  
Balance at end of period 966,792 814,351  
Noncontrolling Interests      
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]      
Balance at beginning of period 358,934 252,957  
Contributions from noncontrolling interests and redeemable noncontrolling interests 187,021 368,902  
Distributions to noncontrolling interests and redeemable noncontrolling interests (44,362) (31,098)  
Net income (loss) (184,368) (229,873)  
Balance at end of period $ 317,225 $ 360,888