Derivative Financial Instruments Effectiveness Testing (Details) - Interest rate swap agreements [Member] - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2016
Gain/(loss) reclassified from accumulated other comprehensive income/(loss) into earnings due to ineffectiveness	$ 0	$ 0	$ 0	$ 0
Existing net losses realized and recorded as interest expense	$ 800,000	$ 600,000	$ 1,600,000	$ 1,000,000
Scenario, Forecast [Member]
Existing net losses expected to be realized within the next 12 months					$ (1,900,000)