Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands		Dec. 31, 2015	Dec. 31, 2014
Statement Of Financial Position [Abstract]
Accounts receivable, allowance		$ 2,839	$ 2,847
Accumulated depreciation	[1]	34,107	27,221
Accumulated amortization		$ 59,594	$ 53,756
Common Stock, par value
Common Stock, shares authorized		55,000,000	55,000,000
Common Stock, shares issued		36,321,775	35,696,742
Common Stock, shares outstanding		36,321,775	35,696,742

[1] Includes accumulated amortization of capital lease obligations.