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Share-Based Payments - Non-vested Roll forward (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Stock options, pre-tax compensation	$ 241	$ 187
Stock option, tax benefit	18	27
Nonvested awards, total compensation cost not yet recognized, stock options	$ 593
Nonvested awards, total compensation cost not yet recognized, period for recognition	2 years 9 months 18 days

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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