Equity (Details) - USD ($)		3 Months Ended		6 Months Ended
	Apr. 02, 2017	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Increase decrease in stockholders equity roll forward
Total stockholders' equity				$ 2,316,244,000
Balance				2,316,244,000	$ 2,520,548,000
Net income (loss)		$ 41,215,000	$ (229,804,000)	78,539,000	(215,974,000)
Other comprehensive income (loss)		396,000	376,000	(56,000)	(1,058,000)
Dividends declared on preferred stocks				(171,000)	(343,000)
Dividends declared on common stock				(75,192,000)	(73,239,000)
Stock-based compensation				1,629,000	2,015,000
Repurchase of common stock				(1,684,000)
Issuance of common stock upon vesting of stock-based compensation, net of shares used for tax withholdings					(323,000)
Net tax deficit on stock-based compensation					(1,664,000)
Contribution from noncontrolling interest					7,648,000
Total stockholders' equity		2,302,952,000	2,237,610,000	2,302,952,000	2,237,610,000
Balance		$ 2,302,952,000	2,237,610,000	2,302,952,000	2,237,610,000
Redeemable Preferred Stock Classified as Long Term Debt	$ 300,000
Payments for Repurchase of Redeemable Preferred Stock				15,900,000
Total stockholders’ equity [Member]
Increase decrease in stockholders equity roll forward
Total stockholders' equity					2,396,505,000
Net income (loss) attributable to parent					(84,283,000)
Other comprehensive income (loss)					(1,058,000)
Dividends declared on preferred stocks					(343,000)
Dividends declared on common stock					(73,239,000)
Stock-based compensation					2,015,000
Issuance of common stock upon vesting of stock-based compensation, net of shares used for tax withholdings					(323,000)
Net tax deficit on stock-based compensation					(1,664,000)
Contribution from noncontrolling interest					0
Total stockholders' equity			2,237,610,000		2,237,610,000
Noncontrolling interest [Member]
Increase decrease in stockholders equity roll forward
Noncontrolling interest					124,043,000
Loss from discontinued operations attributable to noncontrolling interest					(131,691,000)
Other comprehensive income (loss)					0
Dividends declared on preferred stocks					0
Dividends declared on common stock					0
Stock-based compensation					0
Issuance of common stock upon vesting of stock-based compensation, net of shares used for tax withholdings					0
Net tax deficit on stock-based compensation					0
Contribution from noncontrolling interest					7,648,000
Noncontrolling interest			$ 0		$ 0
Common Stock [Member]
Increase decrease in stockholders equity roll forward
Redemption of preferred stock				(757,000)
Preferred Stock [Member]
Increase decrease in stockholders equity roll forward
Redemption of preferred stock				$ (15,600,000)