Commitments and Contingencies (Narrative) (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Commitments and Contingencies [Line Items]
Non-operating expense - securities litigation	$ (4,226,000)	$ 0	$ (4,226,000)	$ 0
Nonoperating Income (Expense) (net of tax)	(2,630,000)
Document Period End Date			Sep. 30, 2013
Rent expense, operating leases			4,900,000	4,200,000
Self-insured health insurance, liability	302,000		302,000
Maximum [Member]
Commitments and Contingencies [Line Items]
Self-insured health insurance limit, per person			120,000
Self-insured health Insurance, aggregate liability based on participants and claims (percentage)			125.00%
Self-insured health insurance, estimated cumulative liability for annual contract	2,900,000		2,900,000
Computer Equipment [Member] | Minimum [Member]
Commitments and Contingencies [Line Items]
Capital lease obligation, term			3 years
Computer Equipment [Member] | Maximum [Member]
Commitments and Contingencies [Line Items]
Capital lease obligation, term			5 years
Microsoft [Member]
Commitments and Contingencies [Line Items]
Estimated Litigation Liability	$ 75,000		$ 75,000