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New Accounting Pronouncements (Details) - USD ($) $ in Thousands		3 Months Ended	12 Months Ended
	Jan. 01, 2017	Sep. 30, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Jan. 01, 2018
New Accounting Pronouncements
Income tax benefit			$ 498,507	$ (11,307)	$ (55,924)
Increase in deferred asset valuation allowance		$ (766,200)	(714,800)
Net cash provided by (used in) operating activities			459,079	411,719	413,808
Net cash provided by (used in) financing activities			(189,028)	(339,930)	395,533
Retained earnings			(1,051,818)	(1,525,281)
Accrued expenses			125,688	101,906
Accounting Standards Update 2016-09
New Accounting Pronouncements
Income tax benefit			$ 6,300
Accounting Standards Update 2016-09 \| Adjustment
New Accounting Pronouncements
Increase in deferred tax assets	$ 15,400
Increase in deferred asset valuation allowance	$ 15,400
Net cash provided by (used in) operating activities				6,900	14,800
Net cash provided by (used in) financing activities				$ (6,900)	$ (14,800)
Accounting Standards Update 2014-09 \| Forecast Adjustment
New Accounting Pronouncements
Retained earnings						$ (11,400)
Accrued expenses						$ 11,400