Leases - Maturities of Operating and Financing Lease Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Operating Leases, After Adoption of 842
2019 (excluding the quarter ended March 31, 2019)	$ 4,769
2020	7,997
2021	5,850
2022	3,960
2023	2,190
Thereafter	1,397
Total future minimum lease payments	26,163
Less: Imputed interest	2,097
Total lease liabilities	24,066
Finance Leases, After Adoption of 842
2019 (excluding the quarter ended March 31, 2019)	257
2020	389
2021	195
2022	146
2023	108
Thereafter	0
Total future minimum lease payments	1,095
Less: Imputed interest	83
Total lease liabilities	$ 1,012
Capital Leases, Before Adoption of 842
Less: imputed interest		$ 120
Total		1,303
Property Subject to Operating Lease
Operating Leases, Before Adoption of 842
2019		9,645
2020		8,815
2021		7,425
2022		5,456
2023		2,349
Thereafter		1,328
Total future minimum lease payments		35,018
Equipment | Capital Lease Obligations
Capital Leases, Before Adoption of 842
2019		748
2020		307
2021		131
2022		133
2023		104
Thereafter		0
Total future minimum lease payments		$ 1,423