Contingent Consideration (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014 Contingent consideration accrued, current [Member]	Dec. 31, 2013 Contingent consideration accrued, current [Member]	Mar. 31, 2014 Contingent consideration accrued, noncurrent [Member]	Dec. 31, 2013 Contingent consideration accrued, noncurrent [Member]
Business Combination, Contingent Consideration Arrangements [Abstract]
Business Combination, Contingent Consideration, Liability			$ 429	$ 492	$ 0	$ 409
Payments of the liability-classified contingent consideration arrangements	$ 500	$ 979