SCHEDULE II--Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Allowance for Doubtful Accounts
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	$ 3,780	$ 3,919	$ 5,594
Additions, Costs and Expenses	6,515	5,073	165
Deductions, Write-offs	(3,339)	(5,212)	(1,840)
Other	0	0	0
Balance at End of Period	6,956	3,780	3,919
Valuation Allowance for Deferred Tax Assets
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	426,991	40,646	18,773
Additions, Costs and Expenses	4,416,478	386,087	4,618
Deductions, Write-offs	(2,039)	(17,106)	(3,799)
Other	(221)	17,364	21,054
Balance at End of Period	$ 4,841,209	$ 426,991	$ 40,646