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Dividends Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 6 Months Ended | 12 Months Ended | 0 Months Ended
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Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Jun. 30, 2011 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Mar. 13, 2013
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cash dividend declared (in dollars per share) | $ 0.345 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.345 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.345 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.30 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.30 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.30 us-gaap_CommonStockDividendsPerShareDeclared |  | $ 0.345 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.30 us-gaap_CommonStockDividendsPerShareDeclared |  |
Payment of cash dividends |  |  |  |  |  |  |  | $ 81,371 us-gaap_PaymentsOfDividendsCommonStock | $ 70,514 us-gaap_PaymentsOfDividendsCommonStock | $ 48,374 us-gaap_PaymentsOfDividendsCommonStock |
Dividend Declared [Member] |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cash dividend declared (in dollars per share) |  |  |  |  |  |  |  |  |  |  | $ 0.350 us-gaap_CommonStockDividendsPerShareDeclared / us-gaap_DividendsAxis = us-gaap_DividendDeclaredMember
Date dividend to be paid |  |  |  |  |  |  |  |  |  |  | Mar. 18, 2015
Date of record of stockholders to whom dividends will be paid |  |  |  |  |  |  |  |  |  |  | Feb. 27, 2015

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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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- Definition Date the declared dividend will be paid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 + Details
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- Definition Date the holder must own the stock to be entitled to the dividend, in CCYY-MM-DD format. + References No definition available. + Details
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- Definition Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 + Details
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