Acquisitions - Schedule of Equity Issued for Acquisition (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Business Acquisition, Equity Interests Issued or Issuable [Line Items]
Shares issued as payments for acquisitions	$ 1,570	$ 9,035	$ 5,211
Series of Business Acquisitions | Common Stock
Business Acquisition, Equity Interests Issued or Issuable [Line Items]
Payments for acquisitions (in shares)	0	0	223
Payments of contingent consideration (in shares)	238	1,092	199
Total (in shares)	238	1,092	422
Shares issued as payments for acquisitions	$ 0	$ 0	$ 2,489
Shares issued as payment of contingent consideration	1,570	9,034	2,723
Total	$ 1,570	$ 9,034	$ 5,212
Payments for acquisition (in USD per share)	$ 0.00	$ 0.00	$ 11.17
Payments of contingent consideration (in USD per share)	6.59	8.27	13.66
Total (in USD per share)	$ 6.59	$ 8.27	$ 12.35