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Shareholders' Equity (Narrative) (Details) (USD $) | 6 Months Ended
--- | ---
Jun. 30, 2013 | Jun. 30, 2012
Subsequent event [Line Items] |  |
Dividends Payable, Date to be Paid | Aug. 12, 2013 |
Additional stock repurchase authorization amount | $ 250,000,000 |
Stock Repurchase Program, Authorized Amount | 352,300,000 |
Stock repurchased under authorized repurchase program | 0 |
Payments for Repurchase of Common Stock | $ 6,447,000 | $ 908,000
Subsequent Event [Member] | Common Stock [Member] |  |
Subsequent event [Line Items] |  |
Common Stock, Dividends, Per Share, Declared | $ 0.05 |

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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + 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 S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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