Commitments and Contingencies (Leases) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Leased Assets [Line Items]
Rent expense	$ 5,400,000	$ 4,300,000	$ 3,400,000
Deferred rent credit, noncurrent	600,000	400,000
Capital Lease Obligations | Minimum
Leased Assets [Line Items]
Debt interest rate	1.80%
Capital Addition Purchase Commitments | Capital Lease Obligations
Leased Assets [Line Items]
Debt face amount			3,100,000
Maintenance and Support
Leased Assets [Line Items]
Recorded unconditional purchase obligation	$ 300,000	$ 1,600,000