Income Taxes (Details 3) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Deferred tax assets:
Allowance for doubtful accounts	$ 492	$ 380
Accrued liabilities	1,131	1,363
Stock-based compensation expense	499	1,174
Net federal, state and foreign operating loss carryforwards	288	465
Deferred tax assets	2,410	3,382
Deferred tax liabilities:
Intangible assets, property and equipment, principally due to difference in depreciation and amortization	6,990	5,709
Net deferred tax liabilities	(4,580)	(2,327)
Less valuation allowance	(263)	(326)
Net deferred tax liabilities, net of valuation allowance	$ (4,843)	$ (2,653)