Fair Value of Financial Instruments - Summary of Estimated Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
7% Senior Notes
Financial liabilities:
Long-term debt	$ 367,579	$ 366,859
Term Loan
Financial liabilities:
Long-term debt		406,047
Revolving Credit Facility
Financial liabilities:
Long-term debt		26,977
Carrying Amount
Financial assets:
Cash and cash equivalents	134,903	61,029
Restricted cash	21,307	2,414
Marketable securities	17,461	0
Financial liabilities:
Acquisition-related contingent considerations	460	496
Carrying Amount | New Term Loan
Financial liabilities:
Long-term debt	981,559	0
Carrying Amount | 7% Senior Notes
Financial liabilities:
Long-term debt	367,579	366,859
Carrying Amount | 6% Senior Notes
Financial liabilities:
Long-term debt	881,091	0
Carrying Amount | Term Loan
Financial liabilities:
Long-term debt	0	406,047
Carrying Amount | Revolving Credit Facility
Financial liabilities:
Long-term debt	0	26,977
Carrying Amount | Other long-term debt
Financial liabilities:
Long-term debt	2,950	0
Fair Value
Financial assets:
Cash and cash equivalents	134,903	61,029
Restricted cash	21,307	2,414
Marketable securities	17,461	0
Financial liabilities:
Acquisition-related contingent considerations	460	496
Fair Value | New Term Loan
Financial liabilities:
Long-term debt	1,003,177	0
Fair Value | 7% Senior Notes
Financial liabilities:
Long-term debt	402,187	397,500
Fair Value | 6% Senior Notes
Financial liabilities:
Long-term debt	916,563	0
Fair Value | Term Loan
Financial liabilities:
Long-term debt	0	423,858
Fair Value | Revolving Credit Facility
Financial liabilities:
Long-term debt	0	29,000
Fair Value | Other long-term debt
Financial liabilities:
Long-term debt	$ 2,950	$ 0