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Consolidated Condensed Statements of Cash Flows (Parenthetical) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2013
Shares repurchased under the share repurchase program, value | $ 32,495 | [1]
Stock Repurchase Authorization [Member] | Common Stock [Member] |  |
Shares repurchased under the share repurchase program, value | $ 30,000 |
[1] | Quarter ended March 31, 2013, includes $30.0 million repurchased under the share repurchase program launched in fourth quarter 2011.

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- Definition Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30, 31 -Article 5 + Details
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Balance Type: | debit
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