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Shareholders' Equity (Details Textual) (USD $)
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1 Months Ended | 3 Months Ended | 6 Months Ended | 1 Months Ended | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Apr. 30, 2013
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Feb. 28, 2013
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Jul. 31, 2012
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Apr. 30, 2012
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Feb. 29, 2012
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Jun. 30, 2013
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Mar. 31, 2013
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Jun. 30, 2012
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Mar. 31, 2012
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Jun. 30, 2013
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Jun. 30, 2012
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Dec. 31, 2012
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Jul. 31, 2013
Subsequent Event [Member]
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Feb. 28, 2013
Management Awards [Member]
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Feb. 28, 2013
Performance Shares [Member]
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Feb. 28, 2013
Minimum [Member]
Performance Shares [Member]
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Feb. 28, 2013
Maximum [Member]
Performance Shares [Member]
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| Shareholders Equity (Textual) [Abstract] | |||||||||||||||||
| Authorized common stock (in shares) | 100,000,000 | 100,000,000 | 100,000,000 | ||||||||||||||
| Authorized preferred stock (in shares) | 50,000,000 | 50,000,000 | 50,000,000 | ||||||||||||||
| Quarterly dividend declared, per share (USD per share) | $ 0.25 | $ 0.25 | $ 0.125 | $ 0.125 | $ 0.5 | $ 0.25 | |||||||||||
| Dividend declared | $ 15,400,000 | $ 15,400,000 | $ 7,700,000 | $ 7,700,000 | |||||||||||||
| Dividend payments | 15,400,000 | 7,700,000 | 7,700,000 | 0 | 15,320,000 | 15,270,000 | 15,400,000 | ||||||||||
| Dividends Payable | 15,400,000 | 7,700,000 | 15,400,000 | 7,700,000 | |||||||||||||
| Total authorizations which remain available for use | 135,100,000 | 135,100,000 | |||||||||||||||
| Share-based compensation | 2,400,000 | 2,900,000 | 4,708,000 | 5,072,000 | |||||||||||||
| Tax benefits from share-based compensation expense | $ 800,000 | $ 1,000,000 | $ 1,600,000 | $ 1,800,000 | |||||||||||||
| Awards in period (in shares) | 39,000 | 146,000 | |||||||||||||||
| Fair value of each unit awarded (USD per share) | $ 46.97 | $ 46.97 | |||||||||||||||
| Award vesting period | 3 years | 3 years | |||||||||||||||
| Award payout rate | 125.00% | 75.00% | 125.00% | ||||||||||||||
| Shares issued in period for share-based compensation (in shares) | 32,000 | 120,000 | |||||||||||||||
| Bonus compensation shares issued (in shares) | 41,000 | 19,000 | |||||||||||||||
| Federal statutory income tax rate | 35.00% | 35.00% | 35.00% | 35.00% | |||||||||||||