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Long-term Debt - Narrative (Details) - USD ($)
3 Months Ended
Apr. 12, 2011
Mar. 31, 2016
Mar. 31, 2015
Apr. 15, 2014
Debt Instrument [Line Items]        
Private placement date Apr. 12, 2011      
Issuance of private placement, principal amount $ 200,000,000.0      
Interest rate 8.75% 8.75%    
Term of payments of interest on notes semi-annually      
Total amount of debt to be retired       $ 50,000,000
Percentage of debt to be retired from the total debt       25.00%
Interest expense on note   $ 3,300,000    
Senior Secured Notes [Member]        
Debt Instrument [Line Items]        
Interest expense on note     $ 3,300,000