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Derivative Instruments (Details)
In Thousands, unless otherwise specified
1 Months Ended 3 Months Ended 3 Months Ended 4 Months Ended
Mar. 22, 2013
USD ($)
Mar. 31, 2013
USD ($)
Number
Mar. 31, 2012
USD ($)
Jan. 15, 2013
GBP (£)
Number
Sep. 17, 2012
CAD
Sep. 17, 2012
GBP (£)
Aug. 30, 2012
GBP (£)
Feb. 15, 2012
CAD
Mar. 31, 2013
Interest Rate Swap [Member]
USD ($)
Mar. 31, 2012
Interest Rate Swap [Member]
USD ($)
Mar. 31, 2013
Foreign Exchange Contract [Member]
USD ($)
Mar. 31, 2012
Foreign Exchange Contract [Member]
USD ($)
May 03, 2012
Foreign Exchange Contract [Member]
USD ($)
Derivative Instruments (Textual) [Abstract]                          
Number of interest rate swaps   1   3                  
Foreign exchange contract         14,000 £ 23,000   250,000          
Gain (loss) on recognized in OCI                 946 739 75,857 0  
Gain (loss) reclassified from AOCI into income                 (475) (461)      
Gain (loss) recognized in income 2,309 2,309 555               (2,309) 0 2,772
Gain (loss) recognized in income (ineffective portion)                     0 (555)  
Additional Derivative Instruments (Textual) [Abstract]                          
Hedging losses included in accumulated other comprehensive income   2,911                      
Notional amount of interest rate swap   $ 11,835   £ 675,000     £ 125,000