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Stock Incentive Plans (Details) (USD $)
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0 Months Ended |
12 Months Ended |
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May 19, 2010
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Dec. 31, 2014
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Dec. 31, 2013
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Feb. 03, 2015
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| Stock Incentive Plans |
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| Maximum number of shares that may be delivered to participants |
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4,000,000 |
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| Period from effective date after which no awards may be granted |
10 years |
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| Stock Incentive Plans |
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| Treasury Stock, Shares |
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1,426,323 |
1,482,777 |
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| Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased |
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895,655 |
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| Maximum | Options and SARs |
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| Stock Incentive Plans |
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| Shares available for grant during any calendar year |
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400,000 |
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| Maximum | Stock awards |
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| Stock Incentive Plans |
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| Shares available for grant during any calendar year |
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200,000 |
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| Maximum | Cash incentive awards and cash-settled stock awards |
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| Stock Incentive Plans |
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| Amount of award payable with respect to any calendar year |
|
1,000,000 |
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| Subsequent event |
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| Stock Incentive Plans |
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| Shares authorized for repurchase under stock repurchase plan |
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2,000,000 |