Commitments and Contingencies (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013 Complaint	Dec. 31, 2012	Dec. 31, 2011
Commitments and Contingencies [Line Items]
Nonoperating Income (Expense)	$ (4,226,000)	$ 0	$ 0
Nonoperating Income (Expense) (net of tax)	(2,630,000)
Number of derivative complaints	3
Rent expense, operating leases	6,500,000	5,900,000	4,600,000
Operating Leases, Rent Expense, Sublease Rentals	55,000	5,000	0
Self-insured health insurance, liability	302,000	243,000
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	2,900,000.0
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