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