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Stockholders' Equity (Details) (USD $) | 3 Months Ended | 20 Months Ended | 3 Months Ended
--- | --- | --- | ---
Mar. 31, 2014 | Mar. 31, 2013 | Mar. 31, 2014 2012 Repurchase Program [Member] | Mar. 31, 2014 2012 Repurchase Program [Member] | Mar. 31, 2014 Performance Shares [Member] | Mar. 31, 2013 Performance Shares [Member]
Class of Stock [Line Items] |  |  |  |  |  |
Allocated Share-based Compensation Expense | $ 2,729,000 | $ 2,926,000 |  |  | $ 500,000 | $ 400,000
Stock Repurchase Program, Authorized Amount |  |  | 50,000,000 |  |  |
Payments for Repurchase of Common Stock | 4,069,000 | 0 | 4,064,000 | 25,000,000 |  |
Treasury Stock, Shares, Acquired |  |  | 145,737 | 1,030,382 |  |
Treasury Stock Acquired, Average Cost Per Share |  |  | $ 27.92 | $ 24.29 |  |
Stock Repurchase Program, Remaining Authorized Repurchase Amount |  |  | $ 25,000,000 |  |  |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition The cash outflow to reacquire common stock during the period. + 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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