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Long-Term Debt, Net Long-Term Debt Textuals (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
Dec. 31, 2013
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Debt Instrument [Line Items]            
Interest Expense, debt   $ 1,300 $ 1,500 $ 2,600 $ 2,800  
Accrued interest, noncurrent   2,600   2,600   $ 2,000
Secured Debt            
Debt Instrument [Line Items]            
Issuance date Dec. 27, 2013          
Term loan, increase $ 20,000          
Total term loan balance   $ 50,000   $ 50,000    
Maturity date       Jan. 01, 2018    
Debt Instrument, interest only period       interest only payments through January 2016    
Interest rate, stated percentage   7.55%   7.55%    
Final payment as percent of original principal       8.50%    
Final payment   $ 4,250   $ 4,250    
Debt instrument, covenant in compliance       in compliance    
Secured Debt | Minimum            
Debt Instrument [Line Items]            
Prepayment fee, percent   1.00%   1.00%    
Secured Debt | Maximum            
Debt Instrument [Line Items]            
Prepayment fee, percent   3.00%   3.00%