Derivative Instruments (Details Textual)	3 Months Ended		4 Months Ended	5 Months Ended	6 Months Ended	7 Months Ended	9 Months Ended
	Mar. 22, 2013 USD ($)	Mar. 30, 2013 USD ($)	May 03, 2012 USD ($)	May 22, 2013 USD ($)	Jul. 12, 2013 USD ($)	Jul. 31, 2013 USD ($)	Sep. 30, 2013 USD ($) Number	Jul. 31, 2013 GBP (£) Number	Jul. 12, 2013 GBP (£) Number	May 22, 2013 CAD Number	Apr. 04, 2013 CAD Number	Jan. 15, 2013 GBP (£) Number	Sep. 17, 2012 CAD Number	Sep. 17, 2012 GBP (£)	Aug. 30, 2012 GBP (£)	Jul. 30, 2012 CAD	May 03, 2012 CAD	Feb. 15, 2012 CAD
Derivative Instruments (Textual) [Abstract]
Number of foreign currency derivatives held								2	3	3	3	3	2	2
Number of interest rate derivatives held							1
Notional amount of foreign currency derivatives								£ 144,411,000	£ 675,000,000	600,000,000	600,000,000	£ 675,000,000	14,000,000	£ 23,000,000	£ 125,000,000	250,000,000	250,000,000	250,000,000
Notional amount of interest rate swap							11,692,000
Reclassification period of cash flow hedges							0 years 12 months
Swap Maturity Date			Jul. 31, 2012		Dec. 31, 2013
Hedging losses included in accumulated other comprehensive income	$ (2,309,000)	$ 13,071,000	$ 2,772,000	$ (10,355,000)	$ 63,514,000	$ (4,872,000)	$ (1,910,000)