Lease Obligations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Capital leased assets [Line Items]
Assets acquired under captial lease, net	$ 2,368	$ 0
Operating leases, maximum lease terms	5 years
Capital leases, future minimum payments due, fiscal year maturity [Abstract]
Year ending December 31, 2017	$ 171
2018	271
2019	756
2020	632
2021	515
2022 and after	0
Total minimum lease payments	2,345
Amounts representing interest	2
Present value of net minimum lease payments	2,343
Less current portion	170	0
Long-term capital lease obligations, December 31, 2016	2,173	0
Operating leases, future minimum payments due, fiscal year maturity [Abstract]
Year ending December 31, 2017	6,369
2018	4,559
2019	3,380
2020	2,398
2021	1,164
2022 and after	1,266
Total minimum lease payments	19,136
Operating leases, rent expense	7,536	7,398	$ 6,554
Equipment [Member]
Capital leased assets [Line Items]
Equipment	2,528	0
Less accumulated amortization	$ 160	$ 0