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, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Finance lease cost:        
Finance lease cost, amortization of right-of-use assets $ 3,647 $ 3,126 $ 10,879 $ 8,483
Finance lease cost, interest on lease liabilities 600 167 1,272 414
Operating lease cost 3,438 2,616 9,937 7,749
Short-term lease cost 115 228 1,260 583
Variable lease cost 854 947 2,750 2,454
Sublease income (99) (156) (448) (381)
Total lease cost $ 8,555 $ 6,928 $ 25,650 $ 19,302