Lease Commitments - Maturities of Operating and Financing Lease Liabilities (Details) $ in Thousands	Mar. 31, 2019 USD ($)
Operating Leases
Remainder of 2019	$ 24,395
2020	30,426
2021	17,422
2022	13,232
2023	9,153
After 2024	24,006
Total lease payments	118,634
Less: Interest	17,762
Present value of lease liabilities	100,872
Finance Leases
Remainder of 2019	396
2020	0
2021	5,063
2022	0
2023	0
After 2024	0
Total lease payments	5,459
Less: Interest	0
Present value of lease liabilities	5,459
Lease Liabilities, Payments Due [Abstract]
Remainder of 2019	24,791
2020	30,426
2021	22,485
2022	13,232
2023	9,153
After 2024	24,006
Lease, Liability, Payments, Due	124,093
Total lease payments	17,762
Present value of lease liabilities	$ 106,331