v2.4.0.8

Derivative Instruments and Hedging Activities Schedule of Derivative Instruments (Details) In Thousands, unless otherwise specified | Sep. 30, 2013 USD ($) | Dec. 31, 2012 USD ($) | Dec. 31, 2011 USD ($) | Sep. 30, 2013 Pound Sterling Notional Amount GBP (£) | Sep. 30, 2013 Interest Rate Swap US Dollar Notional Amount USD ($) | Dec. 31, 2012 Interest Rate Swap US Dollar Notional Amount USD ($) | Sep. 30, 2013 Interest Rate Swap Pound Sterling Notional Amount USD ($) | Dec. 31, 2012 Interest Rate Swap Pound Sterling Notional Amount USD ($) | Dec. 31, 2012 Interest Rate Swap Pound Sterling Notional Amount GBP (£) | Sep. 30, 2013 Interest Rate Swap Canadian Dollar Notional Amount USD ($) | Sep. 30, 2013 Interest Rate Swap Canadian Dollar Notional Amount CAD | Dec. 31, 2012 Interest Rate Swap Canadian Dollar Notional Amount USD ($) | Dec. 31, 2012 Interest Rate Swap Canadian Dollar Notional Amount CAD | Sep. 30, 2013 Foreign Exchange Forward Pound Sterling Notional Amount USD ($) | Sep. 30, 2013 Foreign Exchange Forward Pound Sterling Notional Amount GBP (£) | Sep. 30, 2013 Foreign Exchange Forward Euro Notional Amount USD ($) | Sep. 30, 2013 Foreign Exchange Forward Euro Notional Amount EUR (€)
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Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative, notional amount |  |  |  | £ 50,000 | $ 420,000 | $ 520,000 |  |  | £ 50,000 |  | 25,000 |  | 25,000 |  | £ 70,000 |  | € 149,976
Derivative assets, noncurrent | 52 |  |  |  |  |  |  |  |  | 52 |  |  |  |  |  |  |
Derivative liabilities, current | 15,403 | 705 |  |  |  | 705 |  |  |  |  |  |  |  | 7,439 |  | 7,964 |
Derivative liabilities, noncurrent | $ 9,568 | $ 14,938 | $ 10,600 |  | $ 8,631 | $ 12,791 | $ 937 | $ 2,135 |  |  |  | $ 12 |  |  |  |  |

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