Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies - Components of Lease Expense (Details)

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Commitments and Contingencies - Components of Lease Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Finance lease cost:        
Finance lease cost, amortization of right-of-use assets $ 3,126 $ 2,706 $ 8,483 $ 8,302
Finance lease cost, interest on lease liabilities 167 142 414 509
Operating lease cost 2,616 2,433 7,749 7,563
Short-term lease cost 228 145 583 388
Variable lease cost 947 630 2,454 1,953
Sublease income (156) (18) (381) (18)
Total lease cost $ 6,928 $ 6,038 $ 19,302 $ 18,697