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Net Carrying Value of Goodwill (Details) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 | Jun. 30, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Dec. 31, 2011
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Gross carrying value of goodwill and the accumulated impairment charge |  |  |  |  |  |
Gross carrying value | $ 169,865 |  | $ 146,259 |  |  |
Accumulated impairment charge | (40,159) |  | (40,159) |  |  |
Net carrying value | $ 129,706 | $ 119,509 | $ 106,100 | $ 106,100 | $ 106,100 | $ 106,100

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