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Derivative Instruments (Details) - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Effects of derivative instruments      
Amount of Gain Recognized in OCI on Derivatives (Effective Portion) $ (796,000) $ (499,000) $ 1,298,000
Parent Company      
Effects of derivative instruments      
Amount of Gain Recognized in OCI on Derivatives (Effective Portion) 796,000 499,000 (1,298,000)
Cash Flow Hedging      
Effects of derivative instruments      
Amount of Gain Recognized in OCI on Derivatives (Effective Portion)     1,690,000
Amount of Loss (Gain) Reclassified from Accumulated OCI into Income (Effective Portion)   (499,000) 1,485,000
Significant ineffectiveness on held hedges 0 0 0
Cash Flow Hedging | Interest expense Member      
Effects of derivative instruments      
Amount of Loss (Gain) Reclassified from Accumulated OCI into Income (Effective Portion)   (499,000) 1,485,000
Cash Flow Hedging | Interest rate contracts      
Effects of derivative instruments      
Amount of Gain Recognized in OCI on Derivatives (Effective Portion)     1,690,000
Amount of interest payments reclassified to income statement $ 0 $ 0 $ 1,900,000