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Stock Options (Narrative) (Details) (USD $)	3 Months Ended		6 Months Ended
Stock Options (Narrative) (Details) (USD $)	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012 Year	Jun. 30, 2011
Total stock-based compensation expense recognized	$ 1,600,000	$ 1,100,000	$ 3,500,000	$ 2,000,000
Unrecognized compensation cost	12,700,000		12,700,000
Weighted average period over which unrecognized compensation is expected to be recognized, in years			2.69
Performance condition options
Potential number of shares awarded under options	1,130,700		1,130,700
Performance condition option shares earned	340,270		340,270
Vesting schedule, in years			4 years
Total stock-based compensation expense recognized	$ 32,000	$ 11,000	$ 316,000	$ 77,000

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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- Definition

The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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