Supplemental Cash Flows Information (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Supplemental disclosure of cash flow data:
Interest paid	$ 19,372	$ 21,001
Income taxes paid	7,359	10,081
Supplemental disclosure of non-cash investing and financing activities:
Accrual of redeemable preferred stock paid-in-kind dividends	1,771
Exchanges of Class C and Class D common stock for Class A common stock	882	17,758
Secondary Offering		171,300
Operating lease liabilities from obtaining new or modified right-of-use assets	2,335	12,098
Decrease in operating lease liabilities and corresponding right-of-use assets resulting from lease modifications	$ (6,701)
Acquisition holdback payable		$ 337