Fair Value Measurements - Narrative (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014 Other Long-term Obligations	Dec. 31, 2013 Other Long-term Obligations	Jun. 30, 2014 Accrued Liabilities	Dec. 31, 2013 Accrued Liabilities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other Asset Impairment Charges	$ 85,000	$ 2,000	$ 119,000	$ 53,000
Contingent consideration liability					1,900,000	2,300,000
Contingent consideration liability							$ 620,000	$ 274,000