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Common Stockholders' Equity (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Common Stockholders' Equity |  |  |
Number of common stock shares repurchased | 172,232 us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation |  |
Common stock shares repurchased, value | $ 7,044 us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation | $ 4,539 us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation | $ 2,422 us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation

X
- Definition The amount of adjustment to stockholders' equity associated with an employee's income tax withholding obligation as part of a net-share settlement of a share-based award. + References No definition available. + Details
Name: | us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | us-gaap_EquityAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition For net-share settlement of share-based awards when the employer settles employees' income tax withholding obligations, this element represents the number of shares the employees use to repay the employer. + References No definition available. + Details
Name: | us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration