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Employee Benefit Plans (Share-Based Compensation Expense and Related Tax Benefits) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Deferred Income Tax Benefit	$ 1,726	$ 936	$ 429
Stock Options [Member]
Compensation expense	2,621	1,497	673
Non-vested share award [Member]
Compensation expense	2,096	1,012	500
Employee bonus share award [Member]
Compensation expense			$ 82

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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