Derivative Financial Instruments and Hedging (Details 2) (Cash flow hedges, Interest rate swaps, USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Derivative instruments, gain (loss) recognized
Gain (loss) recognized in accumulated other comprehensive income on derivative financial instruments (effective portion)	$ 414	$ (2,215)	$ (1,192)	$ (1,571)
Gain recognized in gain on derivative financial instruments (ineffective portion)	1			2
Interest expense
Derivative instruments, gain (loss) recognized
Loss reclassified from accumulated other comprehensive income to interest expense (effective portion)	$ (441)	$ (88)	$ (1,303)	$ (261)