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Summary of Share Activity with Respect to Deferred Stock Units (Details) (Deferred Stock Units, USD $)	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Deferred Stock Units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of Shares, Granted	29,250	41,250
Number of Shares, Vested	41,250	52,500
Weighted Average Grant Date Fair Value, Granted	$ 13.09	$ 8.40
Weighted Average Grant Date Fair Value, Vested	$ 8.40	$ 13.32

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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- Definition

The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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