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Subsequent Events - Narrative (Details)
$ / shares in Units, $ in Thousands
Jul. 20, 2018
USD ($)
$ / shares
Jul. 12, 2018
GBP (£)
May 07, 2018
USD ($)
shares
May 07, 2018
GBP (£)
shares
Oct. 06, 2016
USD ($)
Jun. 30, 2018
USD ($)
$ / shares
Dec. 31, 2017
USD ($)
$ / shares
Oct. 06, 2016
GBP (£)
Mar. 27, 2014
USD ($)
Mar. 27, 2014
GBP (£)
Aug. 02, 2013
USD ($)
Aug. 02, 2013
GBP (£)
Subsequent Event [Line Items]                        
Common stock, par value (USD per share) | $ / shares           $ 0.01 $ 0.01          
Senior secured notes | $           $ 325,000 $ 326,029          
Janus Holdings and Cabot Holdings                        
Subsequent Event [Line Items]                        
Cash payments to acquire business     $ 234,100 £ 178,500,000                
Parent stock issued in acquisition (shares) | shares     4,906,482 4,906,482                
Senior Notes | Subsequent Event                        
Subsequent Event [Line Items]                        
Cost of capped call option | $ $ 17,800                      
Senior Notes | 2023 Senior Secured Notes | Subsequent Event                        
Subsequent Event [Line Items]                        
Initial conversion price (USD per share) | $ / shares $ 62.48                      
Senior Notes | 2023 Senior Secured Notes | Encore Finance | Subsequent Event                        
Subsequent Event [Line Items]                        
Debt issued | $ $ 172,500                      
Stated interest rate (as a percent) 4.50%                      
Conversion rate (shares per $1,000 principal amount) 22.4090                      
Initial conversion price (USD per share) | $ / shares $ 44.62                      
Senior Notes | Cabot 2020 Notes                        
Subsequent Event [Line Items]                        
Stated interest rate (as a percent)                     8.375% 8.375%
Senior secured notes                     $ 151,700 £ 100,000,000
Senior Notes | Cabot 2020 Notes | Subsequent Event                        
Subsequent Event [Line Items]                        
Extinguishment of Debt, Amount   £ 32,200,000                    
Senior Notes | Existing Cabot 2021 Notes                        
Subsequent Event [Line Items]                        
Stated interest rate (as a percent)                 6.50% 6.50%    
Senior secured notes                 $ 291,800 £ 175,000,000.0    
Senior Notes | Existing Cabot 2021 Notes | Subsequent Event                        
Subsequent Event [Line Items]                        
Extinguishment of Debt, Amount   95,000,000                    
Senior Notes | Exchange Notes | Subsequent Event                        
Subsequent Event [Line Items]                        
If-converted value in excess of principal   128,400,000                    
Senior Notes | Additional Notes | Subsequent Event                        
Subsequent Event [Line Items]                        
Debt issued   £ 34,500,000                    
Face value issued (as a percent)   99.00%                    
Senior Notes | Additional Notes | Encore Finance | Subsequent Event                        
Subsequent Event [Line Items]                        
Stated interest rate (as a percent)   7.50%                    
Senior Notes | Cabot 2023 Notes                        
Subsequent Event [Line Items]                        
Debt issued         $ 442,600     £ 350,000,000.0        
Stated interest rate (as a percent)         7.50%     7.50%        
Face value issued (as a percent)         100.00%