Leases - Future Minimum Lease Obligations (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Operating Leases
Year 1		$ 13,126
Year 2		7,194
Year 3		4,262
Year 4		2,642
Year 5		1,749
Thereafter		7,823
Total		36,796
Finance Leases
Year 1		6,022
Year 2		6,068
Year 3		223
Year 4		260
Year 5		0
Thereafter		0
Total		12,573
Less amounts representing interest costs		(892)
Present value of net minimum capital lease payments		11,681
Less current portion		(5,409)
Present value of net minimum capital lease payments, excluding current portion		$ 6,272
Operating Leases
Year 1	$ 9,351
Year 2	6,426
Year 3	4,196
Year 4	2,594
Year 5	1,393
Thereafter	7,330
Total	31,290
Less amounts representing interest costs	(5,236)
Total lease liability	26,054
Finance Leases
Year 1	6,558
Year 2	4,015
Year 3	223
Year 4	149
Year 5	0
Thereafter	0
Total	10,945
Less amounts representing interest costs	(627)
Total lease liability	$ 10,318