Income Taxes (Details 3) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Deferred income tax assets-
Accounts receivable and allowance for doubtful accounts	$ 1,889	$ 1,626
Stock compensation	3,080	2,793
Accrued liabilities and expenses	19,174	18,670
State net operating loss carryforwards	6,781	6,958
Other	830	761
Total deferred income tax assets	31,754	30,808
Deferred income tax liabilities-
Property and equipment	(5,572)	(7,035)
Long-term contracts	(728)	(535)
Goodwill	(6,037)	(3,562)
Intangible assets	(156)	(1,378)
Other	(357)	(271)
Total deferred income tax liabilities	(12,850)	(12,781)
Less-Valuation allowance	(4,438)	(3,975)
Net deferred income tax assets	14,466	14,052
Deferred income tax assets-
Other noncurrent assets	16,276	15,362
Deferred income tax liabilities-
Deferred income tax liabilities	$ 1,810	$ 1,310