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Debt - Summary of Amendment to Senior Secured Revolving Credit Facility (Details)
12 Months Ended
Dec. 31, 2017
USD ($)
Nov. 05, 2012
USD ($)
Debt Disclosure [Abstract]    
Borrowing capacity (up to) $ 250,000,000 $ 175,000,000
Maximum leverage ratio 60.00%  
Minimum fixed charge coverage ratio 1.5