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Capital Stock (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Treasury stock |  |  |
Beginning Balance, Shares | 3,359,859 | 3,305,418 |
Beginning Balance | $ 44,725 | $ 43,895 |
Common stock repurchased, Shares, as a result of restricted stock forfeitures | 1,920 | 2,719 |
Noncash stock option exercises, Shares |  | 35,298 |
Noncash stock option exercises, Value |  | 531 |
Restricted stock withholdings, Shares | 25,200 | 16,424 |
Restricted stock withholdings, Cost | 494 | 299 |
Restricted stock awards cancelled, Number of Treasury Shares | 4,613 |  |
Ending Balance, Shares | 3,391,592 | 3,359,859 | 3,305,418
Ending Balance | 45,219 | 44,725 | 43,895
Stock Options |  |  |
Number of Options Outstanding Beginning Balance | 140,356 | 1,231,892 | 6,139,670
Weighted Average Exercise Price Beginning Balance | $ 7.63 | $ 7.63 | $ 7.63
Exercise of stock options, net of stock withholdings | (58,190) | (1,091,536) | (4,907,778)
Weighted Average Exercise Price Exercised | $ 7.63 | $ 7.63 | $ 7.63
Number of Options Outstanding Ending Balance | 82,166 | 140,356 | 1,231,892
Weighted Average Exercise Price Ending Balance | $ 7.63 | $ 7.63 | $ 7.63
Aggregate Intrinsic Value | 892 |  |
Number of Options Vested at December 31 ,2011 | 82,166 | 140,356 | 1,231,892
Weighted average Exercise Price Vested at December 31 ,2011 | $ 7.63 | $ 7.63 | $ 7.63
Aggregate Intrinsic Value Vested options at December 31,2011 | 892 |  |
Restricted stock |  |  |
Shares of Restricted Stock Outstanding, Beginning | 1,254,691 | 764,078 | 385,666
Weighted Average Grant Date Fair Value Outstanding, Beginning | $ 14.60 | $ 11.10 | $ 13.32
Shares of Restricted Stock Granted | 424,436 | 683,921 | 472,881
Weighted Average Grant Date Fair Value Granted | $ 19.45 | $ 17.94 | $ 9.69
Shares of Restricted Stock Forfeited | (1,920) | (2,719) | (23,976)
Weighted Average Grant Date Fair Value Forfeited | $ 14.34 | $ 11.03 | $ 11.15
Shares of Restricted Stock Vested | (288,204) | (190,589) | (70,493)
Weighted Average Grant Date Fair Value Vested | $ 10.84 | $ 12.63 | $ 13.77
Shares of Restricted Stock Cancelled | (4,613) | 0 | 0
Weighted Average Grant Date Fair Value Cancelled | $ 18.35 | $ 0.00 | $ 0.00
Shares of Restricted Stock Outstanding, Ending | 1,384,390 | 1,254,691 | 764,078
Weighted Average Grant Date Fair Value Outstanding, Ending | $ 16.85 | $ 14.60 | $ 11.10
at IRR of at least 8.5% [Member] |  |  |
Number of shares vest under restricted stock unit awards |  |  |
Number of shares vesting at an IRR level of at least 8.5% | 51,239 | 132,144 | 101,051
Fair value of shares vesting at an IRR level of at least 8.5% | 991 | 2,423 | 963
at IRR of at least 10.5% [Member] |  |  |
Number of shares vest under restricted stock unit awards |  |  |
Number of shares vesting at an IRR level of at least 10.5% | 102,488 | 264,288 | 202,117
Fair value of shares vesting at an IRR level of at least 10.5% | 1,983 | 4,847 | 1,927
at IRR of at least 12.5% [Member] |  |  |
Number of shares vest under restricted stock unit awards |  |  |
Number of shares vesting at an IRR level of at least 12.5% | 153,727 | 396,429 | 303,168
Fair value of shares vesting at an IRR level of at least 12.5% | $ 2,975 | $ 7,271 | $ 2,891

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X
- Definition The amount allocated to treasury stock. Treasury stock is common and preferred shares of an entity that were issued, repurchased by the entity, and are held in its treasury. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Technical Bulletin (FTB) -Number 85-6 -Paragraph 3 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23315-112656 + Details
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