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Stockholders Equity and Equity Compensation Plans (Details Textual) (USD $) In Millions, except Per Share data, unless otherwise specified | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 0 Months Ended |  |  | 6 Months Ended
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Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 Performance Shares | Jun. 30, 2014 Restricted common stock | Jun. 30, 2014 Restricted common stock | May 22, 2014 Stock Incentive Plan 2005 | Jun. 30, 2014 Stock Incentive Plan 2005 | Dec. 31, 2013 Stock Incentive Plan 2005 | Jun. 30, 2014 Dividend Paid | Jun. 30, 2013 Dividend Paid
Stockholders Equity and Equity Compensation Plans (Additional Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Shares repurchased |  |  |  | 0.5 |  |  |  |  |  |  |  |
Total amount paid |  |  |  | $ 10.0 |  |  |  |  |  |  |  |
Weighted-average price per share |  |  |  | $ 20.21 |  |  |  |  |  |  |  |
Remaining number of shares available for repurchase | 2.1 |  | 2.1 |  |  |  |  |  |  |  |  |
Repurchase of common stock for employee tax withholdings, shares |  |  | 0.2 | 0.2 |  |  |  |  |  |  |  |
Repurchase of common stock for tax withholdings, value |  |  | 6.6 | 4.9 |  |  |  |  |  |  |  |
Cash dividends declared per common share | $ 0.1575 | $ 0.1500 | $ 0.3075 | $ 0.1500 |  |  |  |  |  |  |  |
Cash dividend | 5.4 | 5.1 |  |  |  |  |  |  |  |  |  |
Payment of cash dividends common stock |  |  |  |  |  |  |  |  |  |  | 10.5 | 5.1
Shareholders of Record Date | Jun. 30, 2014 |  |  |  |  |  |  |  |  |  |  |
Dividend payment date | Jun. 30, 2014 |  |  |  |  |  |  |  |  |  |  |
Number of increased authorized shares under incentive plan |  |  |  |  |  |  |  | 2.9 |  |  |  |
Number of authorized shares under incentive plan |  |  |  |  |  |  |  |  | 18.7 | 15.8 |  |
Performance based awards granted to executive management shares |  |  |  |  | 0.1 |  |  |  |  |  |  |
Stock-based compensation expense | $ 3.9 | $ 3.9 | $ 7.7 | $ 7.5 |  |  |  |  |  |  |  |
Stockholders' Equity and Equity Compensation Plans (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Common stock shares issued to members of executive management vesting installments |  |  |  |  | 3 years | 4 years | 4 years |  |  |  |  |

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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 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 Amount of paid and unpaid common stock dividends declared with the form of settlement in cash. + 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 Amount of cash outflow to satisfy an employee's income tax withholding obligation as part of a net-share settlement of a share-based award. + References Reference 1: 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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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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