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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%

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Debt Instrument, Percentage of Face Value Issued

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