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Derivatives - Derivative Gain (Loss) Recognized in Income Statement (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Effect of derivative instruments on results of operations
Interest expense	$ 93,328	$ 88,760	$ 83,899
Accumulated Other Comprehensive Loss | Reclassification adjustments
Effect of derivative instruments on results of operations
Interest expense	$ 1,283

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of the cost of borrowed funds accounted for as interest expense.

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