Fair Value Measurements (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Liabilities:
Goodwill, Impairment Loss			$ 4,099	$ 74,560
Goodwill and other asset impairment	$ 5,875	$ 56,732	7,819	80,057	$ 4,415
Impairment of right-of-use asset			3,700
6.50% Notes due 2024 | Fair Value, Inputs, Level 1 | Senior Notes
Liabilities:
Long term debt, Carrying Amount	900,000	900,000	900,000	900,000
Long term debt, Fair Value	$ 812,250	$ 834,750	$ 812,250	$ 834,750