Capital and Financing Transactions - Hedges table (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Receivables [Abstract]
Amount of gain (loss) recognized in other comprehensive income on derivative	$ 4,110	$ (7,413)	$ (12,580)
Amount of gain (loss) reclassified from accumulated other comprehensive income into interest expense	(5,615)	(4,117)	(2,111)
Amount of gain (loss) reclassified from accumulated other comprehensive income into non-cash expense on interest rate swap included in discontinued operations	0	215	(2,338)
Amount of gain (loss) recognized in income on derivative (ineffective portion, reclassifications of missed forecasted transactions and amounts excluded from effectiveness testing)	$ (390)	$ 0	$ 0