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Debt Senior Notes 6% (Details) - USD ($)
1 Months Ended 3 Months Ended
Jun. 30, 2015
Mar. 31, 2016
May. 31, 2015
Debt Instrument [Line Items]      
Debt issuance costs $ 1,900,000    
Six Percent Senior Secured Notes [Member]      
Debt Instrument [Line Items]      
Debt issuance costs   $ 6,794,000  
Percentage of principal amount, redemption price   106.00%  
Repurchase of senior secured notes purchase price percentage   101.00%  
Senior Notes [Member]      
Debt Instrument [Line Items]      
Senior secured notes, aggregate principal amount issued     $ 210,000,000
Senior Notes [Member] | Six Percent Senior Secured Notes [Member]      
Debt Instrument [Line Items]      
Senior secured note interest rate 6.00%    
Senior secured notes, aggregate principal amount issued $ 230,000,000    
Maximum [Member] | Six Percent Senior Secured Notes [Member]      
Debt Instrument [Line Items]      
Percentage of aggregate principal amount, maximum redeemable   40.00%  
Percentage of principal amount redeemed at redemption date   104.50%  
Minimum [Member] | Six Percent Senior Secured Notes [Member]      
Debt Instrument [Line Items]      
Minimum percentage of aggregate principal amount outstanding, excluding the redemption date   60.00%  
Percentage of principal amount redeemed at redemption date   100.00%