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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, 2011 2007 Amended Share Repurchase Program	Mar. 31, 2008 2007 Amended Share Repurchase Program	Dec. 31, 2012 2011 Share Repurchase Program	Mar. 31, 2008 2011 Share Repurchase Program	Jan. 31, 2013 2013 Share Repurchase Program Subsequent Event
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		1,500,000
Stock repurchased during period (amount)	$ 55,308		$ 61,275

Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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- Definition

Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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