|
Terms of Interest Rate Swap Agreements (Details)
In Thousands, unless otherwise specified |
Mar. 31, 2014
USD ($)
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Dec. 31, 2013
USD ($)
|
Mar. 31, 2014
Interest rate swaps
US Dollar Notional Amount
USD ($)
|
Dec. 31, 2013
Interest rate swaps
US Dollar Notional Amount
USD ($)
|
Mar. 31, 2014
Interest rate swaps
Pound Sterling Notional Amount
USD ($)
|
Mar. 31, 2014
Interest rate swaps
Pound Sterling Notional Amount
GBP (£)
|
Dec. 31, 2013
Interest rate swaps
Pound Sterling Notional Amount
USD ($)
|
Dec. 31, 2013
Interest rate swaps
Pound Sterling Notional Amount
GBP (£)
|
Mar. 31, 2014
Interest rate swaps
Canadian Dollar Notional Amount
USD ($)
|
Mar. 31, 2014
Interest rate swaps
Canadian Dollar Notional Amount
CAD
|
Dec. 31, 2013
Interest rate swaps
Canadian Dollar Notional Amount
USD ($)
|
Dec. 31, 2013
Interest rate swaps
Canadian Dollar Notional Amount
CAD
|
Dec. 31, 2013
Foreign currency forward contracts
Pound Sterling Notional Amount
USD ($)
|
Dec. 31, 2013
Foreign currency forward contracts
Pound Sterling Notional Amount
GBP (£)
|
Mar. 31, 2014
Foreign currency forward contracts
Euro Notional Amount
USD ($)
|
Mar. 31, 2014
Foreign currency forward contracts
Euro Notional Amount
EUR (€)
|
Dec. 31, 2013
Foreign currency forward contracts
Euro Notional Amount
USD ($)
|
Dec. 31, 2013
Foreign currency forward contracts
Euro Notional Amount
EUR (€)
|
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Derivative | ||||||||||||||||||
| Derivative, Notional Amount | $ 420,000 | $ 420,000 | £ 50,000 | £ 50,000 | 25,000 | 25,000 | £ 70,000 | € 149,976 | € 149,976 | |||||||||
| Derivative Liabilities, Current | 11,533 | 21,818 | 10,186 | 11,533 | 11,632 | |||||||||||||
| Derivative Liabilities, Noncurrent | $ 7,760 | $ 8,470 | $ 7,234 | $ 8,099 | $ 469 | $ 345 | $ 57 | $ 26 |