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Fair Value Measurements And Derivative Instruments (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Derivatives, Fair Value [Line Items]          
Unrealized gain (loss) recognized in accumulated other comprehensive income $ 16 $ (65) $ (221) $ (621)  
Unrealized gain (loss) reclassified from accumulated other comprehensive income to interest expense (140) $ 372 319 $ 710  
Gain (loss) to be reclassified to interest expense during next 12 months 304   304    
Carrying (Reported) Amount, Fair Value Disclosure [Member]          
Derivatives, Fair Value [Line Items]          
Carrying value and estimated fair value of debt 1,053,790   1,053,790   $ 1,169,377
Estimate of Fair Value, Fair Value Disclosure [Member]          
Derivatives, Fair Value [Line Items]          
Carrying value and estimated fair value of debt $ 1,053,283   $ 1,053,283   $ 1,170,901