Summary of Significant Accounting Policies (Details) $ / shares in Units, $ in Thousands							3 Months Ended		6 Months Ended
	Jun. 16, 2017 $ / shares	May 12, 2017 $ / shares	Apr. 19, 2017 $ / shares	Mar. 22, 2017 $ / shares	Nov. 02, 2016 $ / shares shares	Oct. 14, 2016	Jun. 30, 2017 USD ($) $ / shares	Jun. 30, 2016 USD ($)	Jun. 30, 2017 USD ($) $ / shares	Jun. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)
Dividend declarations
Cash dividends declared per common share | $ / shares		$ 0.12		$ 0.12			$ 0.12		$ 0.24
Cash dividends paid per common share | $ / shares	$ 0.12		$ 0.12
Cash and Restricted Cash
Restricted cash | $							$ 3,200		$ 3,200		$ 3,100
Accounts receivable
Allowance for doubtful accounts | $							9,600		9,600		12,300
Selling, general and administrative
Foreign currency translation and transactions
Transaction gain (loss) included in selling, general and administrative expense | $							$ 1,000	$ 2,000	$ 3,300	$ 3,900
VIE
Variable interest entities
Ownership percentage							40.00%		40.00%
Outstanding Balance | $							$ 0		$ 0		$ 0
Class of Stock, Common
Initial public offering
Shares converted					11,556,495
Debt converted					22,791,852
Stock split						9
Class of Stock, Common | Initial public offering
Initial public offering
Shares issued					19,333,333
Share price (in dollars per share) | $ / shares					$ 17.00
Class of Stock, Common | Over-allotment option
Initial public offering
Shares issued					2,899,999
Share price (in dollars per share) | $ / shares					$ 17.00
Magnus
Initial public offering
Controlling interest, as a percent					53.10%
Magnus | Class of Stock, Common
Initial public offering
Shares purchased by Magnus					14,818,720
Convertible debt
Initial public offering
Interest rate (as a percent)						7.50%