Discontinued Operations and Assets Held for Sale (Table Illustration of Discontinued Operations in Income Statement) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Discontinued Operations
Revenues	$ 3,031	$ 47,843	$ 72,645
Operating expenses	(1,213)	(18,014)	(26,364)
Depreciation and Amortization, Discontinued Operations	(205)	(16,423)	(31,151)
Operating income	1,613	13,406	15,130
Interest expense	(921)	(11,499)	(18,846)
Income (loss) before gain on sales	692	1,907	(3,716)
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax	22,763	133,242	13,467
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax	23,455	135,149	9,751
Discontinued Operation, Tax Effect of Discontinued Operation	(2,969)	0	0
Income (loss) from discontinued operations	$ 20,486	$ 135,149	$ 9,751