Stock-Based Compensation Stock-Based Compensation (ESPP) (Details) (ESPP, USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended
Jun. 30, 2013	Mar. 31, 2013	Jun. 30, 2012	Mar. 31, 2012	Jun. 30, 2013	Jun. 30, 2012	Sep. 30, 2012	Dec. 31, 2012	Sep. 30, 2013 Scenario, Forecast [Member]	Dec. 31, 2013 Scenario, Forecast [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation expense	$ 88		$ 33		$ 187	$ 73
Expected dividend yield assumption (in Percent)					0.60%
Expected volatility assumption (in Percent)					31.00%
Risk-free interest rate assumption (in Percent)		0.08%		0.02%	0.12%	0.06%	0.09%	0.12%	0.135%	0.15%
Expected life assumption (in Years)		3 months		3 months	6 months	6 months	9 months	1 year	9 months	1 year

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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The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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