Lease Commitments - Maturities of Operating and Financing Lease Liabilities (Details) $ in Thousands	Jun. 30, 2019 USD ($)
Operating Leases
Remainder of 2019	$ 16,424
2020	31,079
2021	17,776
2022	13,539
2023	9,590
After 2024	24,009
Total lease payments	112,417
Less: Interest	16,410
Present value of lease liabilities	96,007
Finance Leases
Remainder of 2019	187
2020	0
2021	5,063
2022	0
2023	0
After 2024	0
Total lease payments	5,250
Less: Interest	0
Present value of lease liabilities	5,250
Lease Liabilities, Payments Due [Abstract]
Remainder of 2019	16,611
2020	31,079
2021	22,839
2022	13,539
2023	9,590
After 2024	24,009
Lease, Liability, Payments, Due	117,667
Total lease payments	16,410
Present value of lease liabilities	$ 101,257