Accumulated Other Comprehensive Income (Loss) Changes in Accumulated Other Comprehensive Income (Loss) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance January 1,	$ (140,363)	$ (166,814)
Other comprehensive (loss) income before reclassifications	(2,474)	(1,527)
Amounts reclassified from accumulated other comprehensive income (net of tax)	2,753	4,032
Net current-period other comprehensive (loss) income	279	2,505
Ending balance March 31,	(140,084)	(164,309)
Accumulated Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance January 1,	6,653	12,040
Other comprehensive (loss) income before reclassifications	(2,474)	(1,527)
Amounts reclassified from accumulated other comprehensive income (net of tax)	0	0
Net current-period other comprehensive (loss) income	(2,474)	(1,527)
Ending balance March 31,	4,179	10,513
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance January 1,	(147,016)	(178,854)
Other comprehensive (loss) income before reclassifications	0	0
Amounts reclassified from accumulated other comprehensive income (net of tax)	2,753	4,032
Net current-period other comprehensive (loss) income	2,753	4,032
Ending balance March 31,	$ (144,263)	$ (174,822)