Indebtedness - Schedule of Maturities of Debt, Excluding Debt Discount (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Debt Disclosure [Abstract]
2019	$ 38,673
2020	418,572
2021	70,425
2022	66,463
2023	277,591
Thereafter	906,955
Subtotal	1,778,679
Less: Debt discount	(29,757)
Total	$ 1,748,922	$ 1,294,945

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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, after accumulated amortization, of debt discount.

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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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