Condensed Consolidated Statements of Shareholders' Equity (USD $) In Thousands	Voting Common Stock [Member] Common Stock [Member]	Nonvoting Common Stock [Member] Common Stock [Member]	Paid-In Capital [Member]	Treasury Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Loss [Member]	Shareholders' Equity [Member]	Total
Balance at Dec. 31, 2012	$ 214	$ 95	$ 1,027,266	$ (9,592)	$ (794,128)	$ (37,394)	$ 186,461
Balance, shares at Dec. 31, 2012	21,417	9,506		154
Net income (loss)					16,579
Other comprehensive income (loss)						16,478
Comprehensive income (loss)							33,057
Exercise of restricted stock units	2		(2)
Exercise of restricted stock units, shares	175
Equitable adjustment to restricted stock units for dividends and distributions	1		(1)
Equitable adjustment to restricted stock units for dividends and distributions, shares	120
Shares surrendered to fund withholding taxes	(1)		(8,896)				(8,897)
Shares surrendered to fund withholding taxes, shares	(143)
Adjustment to tax benefit associated with stock-based compensation			(3,128)				(3,128)
Stock-based compensation			417				417
Balance at Dec. 31, 2013	216	95	1,015,656	(9,592)	(777,549)	(20,916)	207,910
Balance, shares at Dec. 31, 2013	21,569	9,506		154
Net income (loss)					5,856			5,856
Other comprehensive income (loss)						2,592		2,592
Comprehensive income (loss)							8,448	8,448
Adjustment to tax benefit associated with stock-based compensation			1,864				1,864
Balance at Sep. 30, 2014	$ 216	$ 95	$ 1,017,520	$ (9,592)	$ (771,693)	$ (18,324)	$ 218,222
Balance, shares at Sep. 30, 2014	21,569	9,506		154