Leases - Operating and Finance Lease Maturities (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Feb. 01, 2019	Jan. 01, 2019	Dec. 31, 2018
Operating
2019	$ 61,224
2020	101,811
2021	79,523
2022	67,029
2023	61,768
2024 and thereafter	168,121
Total lease payments	539,476
Less imputed interest	87,850
Total operating lease liabilities	451,626	$ 15,900	$ 433,400
Less current obligations	93,991			$ 0
Noncurrent operating lease liabilities	357,635			$ 0
Finance
2019	1,066
2020	1,710
2021	910
2022	640
2023	635
2024 and thereafter	2,790
Total lease payments	7,751
Less imputed interest	1,522
Finance Lease, Liability	6,229
Less current obligations	1,649
Long-term lease obligations	$ 4,580