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Stock Repurchase Plan (Details Textual) (USD $) In Millions, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Nov. 03, 2003
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Stock Repurchase Plan [Abstract] |  |  |  |
Authorized common stock for repurchases, amount |  |  |  | $ 15 us-gaap_StockRepurchaseProgramAuthorizedAmount1
Remaining authorized share for repurchases, amount | $ 70.0 us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1 | $ 70.0 us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1 | $ 95.0 us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1 |

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

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- Definition Amount of stock repurchase plan authorized. + References No definition available. + Details
Name: | us-gaap_StockRepurchaseProgramAuthorizedAmount1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount remaining of a stock repurchase plan authorized. + References No definition available. + Details
Name: | us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant