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Impairment Charges (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Impairment [Line Items]        
Impairment loss $ 20,861 $ 0 $ 20,861 $ 0
Discounted Cash Flow Approach [Member] | Fair Value, Inputs, Level 3 [Member]        
Impairment [Line Items]        
Fair Value Inputs, Long-term Revenue Growth Rate 3.00%      
Fair Value Assumptions, Expected Term 5 years      
Fair Value Inputs, Terminal Capitalization Rate 8.00%      
Fair Value Inputs, Discount Rate 11.00%