Debt Debt - Maturities (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Debt Disclosure [Abstract]
2019	$ 20,714
2020	20,714
2021	20,714
2022	370,714
2023	20,714
Thereafter	2,388,940
Total debt	2,842,510	$ 2,517,216
Unamortized discount and deferred financing costs	(38,967)
Total debt per balance sheet	$ 2,803,543	$ 2,475,887

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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 of unamortized debt discount (premium) and debt issuance costs.

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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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