Income Taxes (Details3) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Deferred income tax assets-
Accounts receivable and allowance for doubtful accounts	$ 1,660	$ 2,293
Stock compensation	2,165	2,444
Accrued liabilities and expenses	19,290	19,661
Net operating loss carryforwards	7,794	6,562
Other	613	1,017
Total deferred income tax assets	31,522	31,977
Deferred income tax liabilities-
Property and equipment	(6,660)	(5,357)
Long-term contracts	(671)	(306)
Goodwill	(3,364)	(1,124)
Intangible assets	(2,803)	(3,932)
Other	(947)	(1,131)
Total deferred income tax liabilities	(14,445)	(11,850)
Less-Valuation allowance	(7,605)	(6,140)
Net deferred income tax assets	9,472	13,987
Deferred income tax assets-
Prepaid expenses and other	18,279	19,952
Other noncurrent assets	1,472	2,324
Total deferred income tax assets	19,751	22,276
Deferred income tax liabilities-
Other current liabilities	338	335
Deferred income tax liabilities	9,941	7,954
Total deferred income tax liabilities	$ 10,279	$ 8,289