Long-Term Debt (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Total principal long-term debt	$ 3,007,162	$ 3,031,146
Debt issuance costs	(16,766)	(20,551)
Other (fair market value adjustments and discounts)	(799)	(2,902)
Total long-term debt	2,989,597	3,007,693
Less current portion of long-term debt maturities	162	646
Long-term debt, net of current portion	2,989,435	3,007,047
Unsecured floating rate term loan due quarterly through August 2018
Debt Instrument [Line Items]
Total principal long-term debt	0	20,500
VIE unsecured floating rate term loans due quarterly through December 2018
Debt Instrument [Line Items]
Total principal long-term debt	162	646
Unsecured floating rate term loan due quarterly through June 2020
Debt Instrument [Line Items]
Total principal long-term debt	70,000	100,000
Unsecured floating rate term loan due quarterly through September 2020
Debt Instrument [Line Items]
Total principal long-term debt	180,000	225,000
Borrowings under revolving credit agreement expiring June 2023
Debt Instrument [Line Items]
Total principal long-term debt	72,000	0
Unsecured notes bearing fixed rate interest at 5.125% due October 2019
Debt Instrument [Line Items]
Total principal long-term debt	$ 320,000	320,000
Stated interest rate (as a percent)	5.125%
Unsecured notes bearing fixed rate interest at 5.125% due July 2020
Debt Instrument [Line Items]
Total 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]
Total 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]
Total 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]
Total 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]
Total 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]
Total principal long-term debt	$ 240,000	$ 240,000
Stated interest rate (as a percent)	7.25%

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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