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Stock-Based Compensation (Details) (Restricted Stock [Member], USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2014 | Mar. 31, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013
Grants of Restricted Stock [Line Items] |  |  |  |  |
Restricted Shares Granted (in shares) | 42 | 1,028 |  |  |
Total value of restricted shares granted | $ 1,313 | $ 27,774 |  |  |
Minimum [Member] |  |  |  |  |
Grants of Restricted Stock [Line Items] |  |  |  |  |
Percentage of estimated forfeitures (in hundredths) | 0.00% |  | 0.00% | 0.00% | 0.00%
Value Per Share (in dollars per share) | $ 31.06 | $ 27.01 |  |  |
Maximum [Member] |  |  |  |  |
Grants of Restricted Stock [Line Items] |  |  |  |  |
Percentage of estimated forfeitures (in hundredths) | 10.00% |  | 10.00% | 10.00% | 10.00%
Value Per Share (in dollars per share) | $ 33.840000000000000 | $ 27.18 |  |  |

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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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 (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Gross value of stock (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP). Stock issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans. + References No definition available. + Details
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