Capital and Financing Transactions - Schedule of the Effect of Derivative Instruments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Receivables [Abstract]
Amount of gain (loss) recognized in other comprehensive income on derivatives	$ (7,498)	$ (10,968)	$ 4,110
Amount reclassified from accumulated other comprehensive loss into earnings	7,138	7,445	5,615
Amount of (gain) loss recognized in income on derivatives (ineffective portion, reclassifications of missed forecasted transactions and amounts excluded from effectiveness testing)	$ 1,859	$ (212)	$ 390