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Long-Term Debt (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Apr. 01, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Total principal long-term debt	$ 4,276,454		$ 4,214,067
Debt issuance costs	(29,423)		(31,800)
Other (fair market value adjustments and discounts)	(8,491)		(12,605)
Total long-term debt	4,238,540		4,169,662
Less current portion of long-term debt maturities of VIE loans	646		646
Long-term debt, net of current portion	4,237,894		4,169,016
Unsecured floating rate term loan due quarterly through August 2018
Debt Instrument [Line Items]
Principal long-term debt	60,000		83,700
VIE unsecured floating rate term loans due quarterly through December 2018
Debt Instrument [Line Items]
Principal long-term debt	1,454		1,938
Unsecured floating rate term loan due quarterly through June 2020
Debt Instrument [Line Items]
Principal long-term debt	150,000		180,000
Unsecured floating rate term loan due quarterly through September 2020
Debt Instrument [Line Items]
Principal long-term debt	300,000		0
Borrowings under revolving credit agreement expiring June 2020
Debt Instrument [Line Items]
Principal long-term debt	730,000		720,000
Unsecured notes bearing fixed rate interest at 10% due April 2016
Debt Instrument [Line Items]
Principal long-term debt	$ 0		193,429
Stated interest rate (as a percent)	10.00%	10.00%
Unsecured notes bearing fixed rate interest at 7.125% due September 2018
Debt Instrument [Line Items]
Principal long-term debt	$ 70,000		70,000
Stated interest rate (as a percent)	7.125%
Unsecured notes bearing fixed rate interest at 5.125% due October 2019
Debt Instrument [Line Items]
Principal long-term debt	$ 600,000		600,000
Stated interest rate (as a percent)	5.125%
Unsecured notes bearing fixed rate interest at 5.125% due July 2020
Debt Instrument [Line Items]
Principal long-term debt	$ 600,000		600,000
Stated interest rate (as a percent)	5.125%
Unsecured notes bearing fixed rate interest at 4.875% due September 2021
Debt Instrument [Line Items]
Principal long-term debt	$ 350,000		350,000
Stated interest rate (as a percent)	4.875%
Unsecured notes bearing fixed rate interest at 6.375% due October 2023
Debt Instrument [Line Items]
Principal long-term debt	$ 650,000		650,000
Stated interest rate (as a percent)	6.375%
Unsecured notes bearing fixed rate interest at 5.50% due September 2024
Debt Instrument [Line Items]
Principal long-term debt	$ 325,000		325,000
Stated interest rate (as a percent)	5.50%
Unsecured notes bearing fixed rate interest at 7.75% due June 2027
Debt Instrument [Line Items]
Principal long-term debt	$ 200,000		200,000
Stated interest rate (as a percent)	7.75%
Unsecured notes bearing fixed rate interest at 7.25% due September 2027
Debt Instrument [Line Items]
Principal long-term debt	$ 240,000		$ 240,000
Stated interest rate (as a percent)	7.25%