Accounting Policies (Details 1) - USD ($)	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Schedule of Changes in Accumulated Other Comprehensive Income [Line Items]
Balance, beginning	$ (58,846,000)	$ (76,582,000)
Loss recognized in accumulated OCI	(4,796,000)	(6,869,000)
Loss reclassified from accumulated OCI	11,509,000	15,005,000
Total other comprehensive income	6,713,000	8,136,000
Balance, ending	(52,133,000)	(68,446,000)
Foreign Currency Translation
Schedule of Changes in Accumulated Other Comprehensive Income [Line Items]
Balance, beginning	(84,000)	(116,000)
Loss recognized in accumulated OCI	(80,000)	150,000
Loss reclassified from accumulated OCI	0	0
Total other comprehensive income	(80,000)	150,000
Balance, ending	(164,000)	34,000
Interest Rate Contracts
Schedule of Changes in Accumulated Other Comprehensive Income [Line Items]
Balance, beginning	(58,762,000)	(76,466,000)
Loss recognized in accumulated OCI	(4,716,000)	(7,019,000)
Loss reclassified from accumulated OCI	11,509,000	15,005,000
Total other comprehensive income	6,793,000	7,986,000
Balance, ending	$ (51,969,000)	$ (68,480,000)