Leases - Maturities of Operating Lease Liabilities - ASC 842 (Details) $ in Thousands	Jun. 30, 2019 USD ($)
Maturities of operating lease liabilities:
Remainder of 2019	$ 13,862
2020	25,181
2021	19,459
2022	15,188
2023	11,069
Thereafter	19,878
Total operating lease payments	104,637
Less: Imputed interest	2,903
Present value of lease liabilities	101,734
Maturities of finance lease liabilities
Remainder of 2019	14,306
2020	11,203
2021	9,043
2022	3,986
2023	2,240
2024 and thereafter	3,557
Total finance lease payments	44,335
Less: imputed interest	2,666
Present value of finance lease liabilities	$ 41,669