Lease Obligations (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Lessee, Lease, Description [Line Items]
Lease termination period			10 years
Lease, Cost [Abstract]
Operating lease cost	$ 2,075	$ 1,960	$ 4,234	$ 4,171
Short-term lease cost	3,745	3,269	7,026	8,012
Finance lease cost:
Amortization of right-of-use assets	49	39	105	71
Interest on lease liabilities	7	1	15	3
Total finance lease cost	56	$ 40	120	74
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases			4,336	4,466
Operating cash flows from finance leases			15	3
Financing cash flows from finance leases			105	71
Right-of-use assets obtained in exchange for lease obligations (noncash):
Operating leases			5,633	6,311
Finance leases			0	$ 770
Assets and Liabilities, Lessee [Abstract]
Operating lease right-of-use assets	17,076		17,076		$ 13,979
Current portion of long-term lease obligations	7,423		7,423		7,095
Long-term lease obligations	9,733		9,733		6,976
Total operating lease liabilities	17,156		17,156		14,071
Property and equipment, at cost	1,479		1,479		1,479
Accumulated depreciation	(592)		(592)		(482)
Property and equipment, net	887		887		997
Current maturities of long-term debt	195		195		204
Long-term debt	464		464		560
Total finance lease liabilities	$ 659		$ 659		$ 764
Weighted average remaining lease term: operating leases	3 years 4 months 24 days		3 years 4 months 24 days		2 years 6 months
Weighted average remaining lease term: financing leases	3 years 8 months 12 days		3 years 8 months 12 days		4 years
Weighted average discount rate: operating lease	5.80%		5.80%		6.00%
Weighted average discount rate: financing lease	4.20%		4.20%		4.20%
Operating Leases
2020 (excluding the six months ended June 30, 2020)	$ 3,662		$ 3,662
2021	6,294		6,294
2022	4,300		4,300
2023	2,767		2,767
2024	806		806
Thereafter	1,438		1,438
Total lease payments	19,267		19,267
Less imputed interest	(2,111)		(2,111)
Total operating lease liabilities	17,156		17,156		$ 14,071
Finance Leases
2020 (excluding the six months ended June 30, 2020)	112		112
2021	208		208
2022	161		161
2023	154		154
2024	77		77
Thereafter	0		0
Total lease payments	712		712
Less imputed interest	(53)		(53)
Total finance lease liabilities	$ 659		$ 659		$ 764
Minimum
Lessee, Lease, Description [Line Items]
Lease renewal term			1 month
Maximum
Lessee, Lease, Description [Line Items]
Lease renewal term			8 years