Stockholders' Equity (Summary of the Changes in Stockholders' Equity) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Stockholders’ equity at the beginning of period	$ 295,510
Net loss	2,489	$ (665)
Accumulated other comprehensive loss	436
Exercise of stock options	104
Repurchase of common stock	(1,083)
Purchase of treasury stock	(4,722)
Stockholders’ equity at the end of period	296,585
Nonemployee
Share-based compensation expense	453
Employee
Share-based compensation expense	$ 3,398