CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (USD $) In Thousands, unless otherwise specified	Common Stock and Additional Paid-in-Capital [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Accumulated Deficiency [Member]	Total
BALANCE at Dec. 31, 2011	$ 435,368	$ (34,422)	$ (143,563)	$ 257,383
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	0	0	(178,007)	(178,007)
Share-based compensation expense	3,119	0	0	3,119
Tax impact of forfeited vested shares	(210)	0	0	(210)
Other comprehensive income (loss)	0	(17,412)	0	(17,412)
BALANCE at Dec. 31, 2012	438,277	(51,834)	(321,570)	64,873
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	0	0	(38,313)	(38,313)
Share-based compensation expense	2,411	0	0	2,411
Tax impact of forfeited vested shares	(209)	0	0	(209)
Other comprehensive income (loss)	0	33,122	0	33,122
BALANCE at Dec. 31, 2013	440,479	(18,712)	(359,883)	61,884
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	0	0	(2,307)	(2,307)
Share-based compensation expense	2,456	0	0	2,456
Tax impact of forfeited vested shares	(304)	0	0	(304)
Other comprehensive income (loss)	0	(30,926)	0	(30,926)
BALANCE at Dec. 31, 2014	$ 442,631	$ (49,638)	$ (362,190)	$ 30,803