Income Taxes (Details 3) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Net operating losses
State income tax rate (as a percent)	2.60%
Statutory Federal income tax rate (as a percent)	35.00%
Alternative minimum tax credit without expiration	$ 21,391	$ 17,590
Valuation allowance on acquired non-amortizable intangible tax assets and other tax assets	8,126	9,025
Domestic Tax Authority
Net operating losses
Operating loss carryforward	189,000	379,300
State
Net operating losses
Operating loss carryforward	$ 352,200	$ 452,200