Long-Term Debt (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Total principal long-term debt	$ 4,238,006	$ 4,214,067
Debt issuance costs	(30,513)	(31,800)
Other (fair market value adjustments and discounts)	(10,125)	(12,605)
Total long-term debt	4,197,368	4,169,662
Less current portion of long-term debt maturities of VIE loans	646	646
Long-term debt, net of current portion	4,196,722	4,169,016
Unsecured floating rate term loan due quarterly through August 2018
Debt Instrument [Line Items]
Principal long-term debt	75,800	83,700
VIE unsecured floating rate term loans due quarterly through December 2018
Debt Instrument [Line Items]
Principal long-term debt	1,777	1,938
Unsecured floating rate term loan due quarterly through June 2020
Debt Instrument [Line Items]
Principal long-term debt	170,000	180,000
Borrowings under revolving credit agreement expiring June 2020
Debt Instrument [Line Items]
Principal long-term debt	762,000	720,000
Unsecured notes bearing fixed rate interest at 10% due April 2016
Debt Instrument [Line Items]
Principal long-term debt	$ 193,429	193,429
Stated interest rate (as a percent)	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%

Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer.

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