Leases - Lease Expense and Other Information (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($)
Leases [Abstract]
Operating lease cost	$ 6,183
Finance lease cost:
Amortization of right-of-use assets	24
Interest on lease liabilities	33
Short-term lease cost	45
Sublease income	(95)
Total lease cost	6,190
(Gain)/loss on right-of-use asset impairment-Operating leases	817
Operating cash flows from operating leases	5,302
Operating cash flows from finance leases	33
Financing cash flows from finance leases	31
Right-of-use assets obtained in exchange for lease obligations - operating leases	2,442
Right-of-use assets obtained in exchange for lease obligations - finance leases	$ 0