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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Debt - Maturities (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Oct. 11, 2018	Feb. 28, 2018	Jan. 31, 2018	Dec. 31, 2017	Jan. 31, 2017
Long-term debt
Other	$ 561				$ 181
Long-term Debt	3,624,770				4,055,944
Less: current portion	561				181
Less: deferred financing costs	38,325				27,997
Long-term Debt, Excluding Current Maturities, Total	3,585,884				4,027,766
Maturity of primary debt
2020	785,271
2021	668,999
2023	929,519
Thereafter	1,366,502
Total	$ 3,750,291
6.15% senior notes due February 2018
Long-term debt
Senior Notes					460,762
Interest rate on senior notes due (as a percent)	6.15%		6.15%
9.25% senior notes due January 2019
Long-term debt
Senior Notes					303,489
Interest rate on senior notes due (as a percent)	9.25%
5.00% senior notes due September 2020
Long-term debt
Senior Notes	$ 614,748				669,846
Interest rate on senior notes due (as a percent)	5.00%
4.625% senior notes due September 2021
Long-term debt
Senior Notes	$ 668,347				695,108
Interest rate on senior notes due (as a percent)	4.625%
5.50% senior notes due January 2023
Long-term debt
Senior Notes	$ 586,000				600,000
Interest rate on senior notes due (as a percent)	5.50%
5.10% senior notes due September 2023
Long-term debt
Senior Notes	$ 342,923				346,576
Interest rate on senior notes due (as a percent)	5.10%
0.75% senior exchangeable notes due January 2024
Long-term debt
Senior Notes	$ 450,689				429,982
Less: deferred financing costs						$ 9,600
Interest rate on senior notes due (as a percent)	0.75%					0.75%
5.75% senior notes due February 2025
Long-term debt
Senior Notes	$ 791,502
Interest rate on senior notes due (as a percent)	5.75%			5.75%
2012 Revolving Credit Facility
Long-term debt
Revolving credit facility	$ 170,000				510,000
2018 Revolving Credit Facility
Long-term debt
Revolving credit facility	$ 0
Interest rate on senior notes due (as a percent)		5.50%
Commercial paper
Long-term debt
Long-term Debt					$ 40,000
Interest rate on senior notes due (as a percent)			5.75%