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Debt and obligations under capital lease - Narratives (Details)
€ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Jul. 03, 2017
USD ($)
May 26, 2017
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
Jul. 03, 2017
EUR (€)
Jun. 30, 2017
EUR (€)
Aug. 31, 2014
USD ($)
Dec. 31, 1984
USD ($)
Debt Instrument [Line Items]                        
Debt instrument, face amount       $ 499,569,000   $ 499,569,000            
Long-term debt and obligations under capital leases       596,706,000   596,706,000   $ 585,768,000        
Line of credit maximum borrowing capacity       $ 105,000,000   $ 105,000,000            
Interest rate floor       1.00%   1.00%       1.00%    
Secured term loan, annual mandatory amortization, percentage of principal amount           1.00%            
Proceeds from credit facility   $ 45,000,000     $ 0 $ 45,000,000 $ 0          
Gain on extinguishment of debt       $ 0 1,200,000 0 1,200,000          
Guaranteed debt of subsidiary           499,569,000   488,985,000        
Deferred financing costs       8,257,000   8,257,000   9,535,000        
Line of credit maximum borrowing capacity including working capital facility       105,570,000   105,570,000   105,525,000        
Line of credit facility, remaining borrowing capacity including working capital facilities       60,570,000   60,570,000   105,525,000        
Secured Credit Facility                        
Debt Instrument [Line Items]                        
Debt instrument, face amount       551,955,000   551,955,000            
Secured Credit Facility | Subsequent Event                        
Debt Instrument [Line Items]                        
Debt instrument, face amount $ 603,434,000                      
Revolving Credit Facility                        
Debt Instrument [Line Items]                        
Debt instrument, face amount       105,000,000   105,000,000            
Revolving Credit Facility | Subsequent Event                        
Debt Instrument [Line Items]                        
Debt instrument, face amount 100,000,000                      
Variable Interest Entity, Primary Beneficiary                        
Debt Instrument [Line Items]                        
Long-term debt and obligations under capital leases       112,075,000   112,075,000   111,968,000        
Tranche One term loan                        
Debt Instrument [Line Items]                        
Long-term debt and obligations under capital leases       333,788,000   333,788,000            
Tranche One term loan | Secured Credit Facility                        
Debt Instrument [Line Items]                        
Debt instrument, face amount       345,000,000   $ 345,000,000            
Tranche One term loan | Secured Credit Facility | Subsequent Event                        
Debt Instrument [Line Items]                        
Debt instrument, face amount $ 400,000,000                      
Tranche One term loan | LIBOR                        
Debt Instrument [Line Items]                        
Basis spread on variable interest rate           3.00%            
Tranche One term loan | LIBOR | Secured Credit Facility | Subsequent Event                        
Debt Instrument [Line Items]                        
Basis spread on variable interest rate 2.75%                      
Tranche One term loan | LIBOR | Revolving Credit Facility | Subsequent Event                        
Debt Instrument [Line Items]                        
Basis spread on variable interest rate 2.50%                      
Tranche Two term loan                        
Debt Instrument [Line Items]                        
Long-term debt and obligations under capital leases       165,781,000   $ 165,781,000       € 145,125    
Tranche Two term loan | Secured Credit Facility                        
Debt Instrument [Line Items]                        
Debt instrument, face amount       206,955,000   $ 206,955,000       € 150,000    
Tranche Two term loan | Secured Credit Facility | Subsequent Event                        
Debt Instrument [Line Items]                        
Debt instrument, face amount $ 203,434,000               € 179,000      
Tranche Two term loan | EURIBOR                        
Debt Instrument [Line Items]                        
Basis spread on variable interest rate           3.00%            
Tranche Two term loan | EURIBOR | Secured Credit Facility | Subsequent Event                        
Debt Instrument [Line Items]                        
Basis spread on variable interest rate 3.00%                      
Revolving credit facility | LIBOR                        
Debt Instrument [Line Items]                        
Basis spread on variable interest rate           2.75%            
Commitment fee, percentage           0.40%            
Charleston Center LLC | Variable Interest Entity, Primary Beneficiary                        
Debt Instrument [Line Items]                        
Debt instrument, face amount     $ 112,000,000   112,000,000   112,000,000       $ 86,000,000 $ 10,000,000
Interest payable noncurrent     $ 16,819,000   $ 16,819,000   $ 16,819,000          
Gain on extinguishment of debt               1,200,000        
Tax indemnity               2,800,000        
Debt of consolidated VIE       112,980,000   $ 112,980,000   113,098,000        
Deferred financing costs       $ 720,000   $ 720,000   $ 888,000        
Charleston Center LLC | LIBOR | Variable Interest Entity, Primary Beneficiary                        
Debt Instrument [Line Items]                        
Basis spread on variable interest rate     2.35%