Goodwill (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Goodwill [Line Items]
Goodwill	$ 265,423				$ 265,423	$ 596,103	$ 114,963	$ 113,701
Goodwill, Impairment Loss	230,632	0	115,791	0	(330,680)
Black Thunder [Member]
Goodwill [Line Items]
Goodwill				115,800
Goodwill, Impairment Loss					115,800
APP [Member]
Goodwill [Line Items]
Goodwill, Impairment Loss					$ 214,900