Summary of Signitifcant Accounting Policies - Other Comprehensive Loss (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2009
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Net loss	$ 24,968	$ (790)	$ (29,077)	$ 2,361	$ (10,082)	$ (766)	$ (49,313)	$ 36,743	$ (2,539)		$ (23,419)		$ (258,302)
Foreign currency translation gain (loss)									0	[1]	17,079		(2,294)
Post-retirement benefit obligations									(133)	[2]	1,061	[2]	1,171	[2]
Total comprehensive loss									$ (2,672)		$ (5,279)		$ (259,425)

[1] Foreign currency translation gain (loss) relates to our Argentina operations, which were sold during the year ended December 31, 2010.

[2] Included in the balance are benefit obligations related to both the executive deferred compensation plan and directors’ health and medical plan, both of which are discussed in Note 6, Employee Benefit Plans.