Leases - Maturity of Obligations related to Operating and Finance Leases (Details) $ in Thousands	Jun. 30, 2019 USD ($)
Operating Leases
2019 (excluding the six months ended June 30, 2019)	$ 7,932
2020	13,030
2021	9,235
2022	7,266
2023	5,961
Thereafter	27,550
Total undiscounted cash flows related to lease liabilities	70,974
Less imputed interest	(17,048)
Total lease liabilities	53,926
Finance Lease, Liability, Payment, Due [Abstract]
2019 (excluding the six months ended June 30, 2019)	2,715
2020	4,541
2021	4,063
2022	3,713
2023	3,772
Thereafter	36,330
Total undiscounted cash flows related to lease liabilities	55,134
Less imputed interest	(23,039)
Total lease liabilities	$ 32,095