Income Taxes (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Contingency [Line Items]
Income before income taxes	$ (166,097,000)	$ (193,785,000)	$ (248,854,000)
Effective tax expense (benefit) rate	(17.90%)	(46.60%)	(38.40%)
Federal statutory rate	35.00%	35.00%	35.00%
NOL carryforwards	247,200,000
State NOL deferred tax asset	12,900,000
Alternative minimum tax and other state credits	0
Tax credit carryforwards	4,800,000
Tax valuation allowance	259,857,000	166,773,000
Federal tax valuation allowance	217,800,000	136,400,000
State tax valuation allowance	42,100,000	30,400,000
Change in valuation allowance	58,200,000
Unrecognized Tax Benefits	4,035,000	4,855,000	3,785,000
Unrecognized tax benefits that would impact the effective tax rate	3,800,000
Other Comprehensive Income (Loss) [Member]
Income Tax Contingency [Line Items]
Change in valuation allowance		10,900,000
Continuing Operations [Member]
Income Tax Contingency [Line Items]
Change in valuation allowance		$ 14,800,000