UNAUDITED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Shares Held Under Employee Participation Plan	Additional Paid-in Capital	Accumulated Other Comprehensive Loss	Accumulated Earnings
Increase (Decrease) in Stockholders' Equity
Cumulative effect of change in accounting for Stock based compensation	$ 231			$ 681		$ (450)
Balance at beginning of period at Dec. 31, 2016	1,084,241	$ 573	$ (469)	725,670	$ (214,326)	572,793
Balance beginning of period (in shares) at Dec. 31, 2016		57,298
Increase (Decrease) in Stockholders' Equity
Net loss	(21,393)					(21,393)
Other comprehensive income	6,051				6,051
Stock-based compensation	2,271			2,271
Issuance of restricted shares, net of shares remitted	(1,021)	$ 0		(1,021)
Issuance of restricted shares, net of shares remitted (in shares)		34
Shares held under employee participation plan	0	$ 0	469	(469)
Shares held under employee participation plan (in shares)		(25)
Repurchases of common stock	$ (6,796)	$ (1)		(6,795)
Repurchases of common stock (in shares)	(100)	(120)
Exercise of stock options	$ 46			46
Exercise of stock options (in shares)		2
Balance at end of period at Mar. 31, 2017	$ 1,063,630	$ 572	$ 0	$ 720,383	$ (208,275)	$ 550,950
Balance ending of period (in shares) at Mar. 31, 2017		57,189