Goodwill (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended			12 Months Ended
	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Goodwill [Line Items]
Goodwill impairment	$ 0	$ 0	$ 0	$ 0	$ 265,423	$ 330,680
Black Thunder [Member]
Goodwill [Line Items]
Goodwill impairment						115,800
APP [Member]
Goodwill [Line Items]
Goodwill impairment					$ 265,400	$ 214,900