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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
Stock Repurchase Plan [Abstract]
Authorized common stock for repurchases, amount				$ 15us-gaap_StockRepurchaseProgramAuthorizedAmount1
Remaining authorized share for repurchases, amount	$ 70.0us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1	$ 70.0us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1	$ 95.0us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1

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- Details

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X

- Definition

Amount of stock repurchase plan authorized.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount remaining of a stock repurchase plan authorized.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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