Net Income Per Share (Narrative) (Details) (Performance Vesting RSUs [Member]) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended
Sep. 30, 2013	Jun. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Performance Vesting RSUs [Member]
Antidilutive securities excluded from EPS	80	231	80	231

- Definition

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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