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Long-Term Debt - Credit Agreement (Details)
1 Months Ended 3 Months Ended 6 Months Ended
Feb. 29, 2016
USD ($)
Jun. 30, 2013
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2015
USD ($)
Sep. 30, 2013
USD ($)
Debt Instrument [Line Items]            
Amortization of debt issuance costs       $ 5,138,000 $ 2,596,000  
Number of foreign subsidiaries designated as not subject to Credit Agreement covenants       5    
Term Loan Maturing June 2018 [Member]            
Debt Instrument [Line Items]            
Borrowing capacity   $ 300,000,000        
Percentage of scheduled principal installments     10.00%      
Scheduled principal installments     $ 30,000,000      
Balloon payment     $ 180,000,000 $ 180,000,000    
Maturity date   Jun. 19, 2018        
Term Loan Maturing June 2018 [Member] | Interest Rate Swaps [Member]            
Debt Instrument [Line Items]            
Notional amount           $ 148,100,000
Term Loan Maturing June 2018 [Member] | LIBOR [Member]            
Debt Instrument [Line Items]            
Basis spread on variable rate (as a percent)     4.00%      
Term Loan Maturing June 2018 [Member] | Minimum [Member] | Interest Rate Swaps [Member]            
Debt Instrument [Line Items]            
Fixed LIBOR rate on interest rate swaps (as a percent)           0.74%
Term Loan Maturing June 2018 [Member] | Minimum [Member] | Base Rate [Member]            
Debt Instrument [Line Items]            
Basis spread on variable rate (as a percent)     1.00%      
Term Loan Maturing June 2018 [Member] | Minimum [Member] | LIBOR [Member]            
Debt Instrument [Line Items]            
Basis spread on variable rate (as a percent)     2.00%      
Term Loan Maturing June 2018 [Member] | Maximum [Member] | Interest Rate Swaps [Member]            
Debt Instrument [Line Items]            
Fixed LIBOR rate on interest rate swaps (as a percent)           0.75%
Term Loan Maturing June 2018 [Member] | Maximum [Member] | Base Rate [Member]            
Debt Instrument [Line Items]            
Basis spread on variable rate (as a percent)     3.00%      
Term Loan Maturing June 2018 [Member] | Maximum [Member] | LIBOR [Member]            
Debt Instrument [Line Items]            
Basis spread on variable rate (as a percent)     4.00%      
Revolving Credit Facility Maturing June 2018 [Member]            
Debt Instrument [Line Items]            
Borrowing capacity $ 400,000,000 $ 600,000,000        
Increase in aggregate commitments (up to)   $ 200,000,000        
Available borrowing capacity     $ 50,800,000 50,800,000    
Letters of credit issued     $ 6,000,000 $ 6,000,000    
Commitment fee percentage     0.50%      
Amortization of debt issuance costs $ 2,500,000