Right-of-Use Asset and Lease Liabilities - Lease Maturities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Jan. 01, 2019
Maturity Of Operating Lease Liabilities
2020	$ 35,997
2021	34,762
2022	33,214
2023	27,859
2024	25,400
Thereafter	43,125
Total lease payments	200,357
Less: imputed interest	(34,001)
Total lease obligations	166,356	$ 132,000
Less: current obligations	(27,156)
Long-term lease obligations	139,200
Maturity Of Finance Lease Liabilities
2020	7,586
2021	4,659
2022	2,333
2023	1,581
2024	315
Thereafter	581
Total lease payments	17,055
Less: imputed interest	(1,385)
Total lease obligations	15,670
Less: current obligations	(6,924)
Long-term lease obligations	$ 8,746