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Debt - Interest Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Debt Disclosure [Abstract]
Gross interest cost	$ 129,571	$ 118,276	$ 133,137
Capitalized interest	(6,671)	(5,656)	(2,290)
Interest expense	$ 122,900	$ 112,620	$ 130,847

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Amount of interest costs capitalized disclosed as an adjusting item to interest costs incurred.

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Total interest costs incurred during the period and either capitalized or charged against earnings.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 20
-Section 50
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Amount of the cost of borrowed funds accounted for as interest expense.

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