Derivative Financial Instruments (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Derivative Financial Instruments [Abstract]
Derivative asset	$ 6,900,000	$ 4,200,000
Interest income (expense) related to the ineffectiveness associated with the fair value hedge	(2,700,000)	$ 3,800,000	$ 800,000
Interest rate swap agreement for notional amount	$ 300,000,000