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Debt and Other Obligations - Term Loan (Details)
3 Months Ended 9 Months Ended 12 Months Ended
May 11, 2018
USD ($)
May 08, 2018
May 07, 2018
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
May 11, 2018
EUR (€)
Jan. 01, 2015
USD ($)
Line of Credit Facility [Line Items]                      
Finance costs directly expensed       $ 512,000 $ 578,000 $ 1,602,000 $ 1,657,000        
Unrealized loss       34,892,000   34,892,000   $ 19,628,000      
Designated as Hedging Instrument | Cash Flow Hedge | Cross Currency Interest Rate Contract                      
Line of Credit Facility [Line Items]                      
Derivative, notional amount $ 235,000,000.0     30,000,000.0   30,000,000.0       € 235,000,000.0  
Designated as Hedging Instrument | Net Investment Hedging | Currency Swap                      
Line of Credit Facility [Line Items]                      
Derivative, notional amount                     $ 180,000,000
Unrealized loss       2,200,000   2,200,000          
Term Loan Facility | Term Loan                      
Line of Credit Facility [Line Items]                      
Estimated annual interest expense reduction $ 4,700,000                    
Finance costs directly expensed       356,000   1,083,000   386,000 $ 1,066,000    
Debt issuance costs       $ (6,303,000)   $ (6,303,000)   $ (7,738,000)      
Term Loan - USD | LIBOR | Term Loan                      
Line of Credit Facility [Line Items]                      
Margin reduction   0.50%                  
Basis spread on variable rate   2.00% 2.50%                
Term Loan - EUR | EURIBOR | Term Loan                      
Line of Credit Facility [Line Items]                      
Margin reduction   0.25%                  
Basis spread on variable rate   2.25% 2.50%