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Capital Stock Narrative (Details) (USD $) In Thousands, except Share data, unless otherwise specified |  | 12 Months Ended |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2013 | Dec. 31, 2011 2007 Amended Share Repurchase Program | Mar. 31, 2008 2007 Amended Share Repurchase Program | Dec. 31, 2013 2011 Share Repurchase Program | Dec. 31, 2012 2011 Share Repurchase Program | Mar. 31, 2008 2011 Share Repurchase Program | Jan. 31, 2013 2013 Share Repurchase Program
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |
Number of shares authorized to be repurchased |  |  | 3,000,000 |  |  | 1,500,000 | 1,500,000
Stock repurchased during period (shares) |  | 1,360,000 |  | 729,000 | 1,500,000 |  |
Stock repurchased during period (amount) |  | $ 55,308 |  | $ 38,692 | $ 61,275 |  |
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased | 771,000 |  |  |  |  |  |

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