Leases (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2019	Jan. 01, 2019	Dec. 31, 2018
Leases [Abstract]
Operating lease right-of-use assets	$ 10,093	$ 10,093	$ 11,400
Finance lease liability	7,589	7,589	11,400
Lease, Cost [Abstract]
Amortization of ROU assets	456	701
Interest on lease liabilities	81	127
Operating lease cost	717	1,579
Short-term lease cost	2,863	4,828
Total lease expense	$ 4,117	7,235
Operating cash flows from operating leases		1,274
Operating cash flows from finance leases		94
Financing cash flows from finance leases		651
ROU assets obtained in exchange for new lease liabilities, Finance leases		4,148
ROU assets obtained in exchange for new lease liabilities, Operating leases		$ 11,111
Weighted-average remaining lease term (years), Finance leases	3 years 6 months 7 days	3 years 6 months 7 days
Weighted-average remaining lease term (years), Operating leases	5 years 2 months 26 days	5 years 2 months 26 days
Weighted-average discount rate, Finance leases	4.90%	4.90%
Weighted-average discount rate, Operating leases	5.00%	5.00%
Assets and Liabilities, Lessee [Abstract]
Finance lease assets	$ 7,490	$ 7,490
Operating lease ROU assets	10,093	10,093	11,400
Finance lease liabilities, Current	2,116	2,116		$ 883
Operating lease liabilities, Current	2,097	2,097
Finance lease liabilities, Noncurrent	5,473	5,473		3,209
Operating lease liabilities, Noncurrent	7,999	7,999
Finance Lease Liabilities, Payments
Remainder of 2019	1,213	1,213
2020	2,426	2,426
2021	2,426	2,426
2022	1,492	1,492
2023	642	642
Thereafter	37	37
Total lease payments	8,236	8,236
Less: Interest	(647)	(647)
Present value of lease liabilities	7,589	7,589	$ 11,400
Less: Current portion of lease obligation	(2,116)	(2,116)		(883)
Finance lease obligations	5,473	5,473		3,209
Operating Lease Liabilities, Payments Due
Remainder of 2019	1,280	1,280
2020	2,498	2,498
2021	2,102	2,102
2022	1,770	1,770
2023	1,668	1,668
Thereafter	2,112	2,112
Total lease payments	11,430	11,430
Less: Interest	(1,334)	(1,334)
Present value of lease liabilities	10,096	10,096
Less: Current portion of lease obligation	(2,097)	(2,097)
Total long-term lease obligation	$ 7,999	$ 7,999
Capital Lease Maturities
2019				1,052
2020				1,052
2021				1,052
2022				909
2023				451
Thereafter				0
Total lease payments				4,516
Less: Interest				(424)
Present value of lease liabilities				4,092
Less: Current portion of lease obligation				(883)
Total long-term lease obligation				3,209
Operating Lease Maturities
2019				4,242
2020				2,258
2021				2,107
2022				1,782
2023				1,495
Thereafter				1,488
Total lease payments				$ 13,372