Income Taxes (Details 3) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Net operating losses
Statutory Federal income tax rate (as a percent)	35.00%
State income tax rate (as a percent)	2.60%
Alternative minimum tax credit without expiration	$ 17,590,000	$ 17,649,000
Valuation allowance on acquired non-amortizable intangible tax assets and other tax assets	9,025,000	3,044,000
Domestic Tax Authority
Net operating losses
Operating loss carryforward	379,300,000	191,500,000
State and Local Jurisdiction
Net operating losses
Operating loss carryforward	$ 452,200,000	$ 651,200,000