Long-Term Debt (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Total principal long-term debt	$ 2,905,000	$ 2,960,000
Debt issuance costs	(14,154)	(15,458)
Unamortized premiums and discounts, net	649	(76)
Total long-term debt	2,891,495	2,944,466
Unsecured floating rate term loan due quarterly through June 20201
Debt Instrument [Line Items]
Total principal long-term debt	50,000	60,000
Unsecured floating rate term loan due quarterly through September 2020
Debt Instrument [Line Items]
Total principal long-term debt	150,000	165,000
Borrowings under revolving credit agreement expiring June 2023
Debt Instrument [Line Items]
Total principal long-term debt	20,000	50,000
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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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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