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Derivatives (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Derivatives (Narrative) (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Derivative [Line Items]
Incremental interest expense paid to interest rate swap counterparties	$ 829	$ 1,500	$ 2,500
2011 Interest Rate Swap
Derivative [Line Items]
Fixed rate payments, interest rate				5.50%
Variable rate payment rate		1.75%		1.75%