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Employee Benefit Plans (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items] |  |  |
Period of service before an employee is eligible for contribution | 1 year |  |
Common stock authorized and reserved for ESPP | 250 |  |
ESPP employee contribution, percentage | 15.00% |  |
Shares issued under ESPP | 1 | 1 |
Fair value of investments in rabbi trust | $ 13,397 | $ 10,037 |
Unrealized gains on investments held in rabbi trust | 722 | 240 |
401(k) Plan [Member] |  |  |
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items] |  |  |
Period of service before an employee is eligible for contribution | 1 year |  |
Company matching contributions | 2,644 | 2,431 | 2,039
Deferred Plan [Member] |  |  |
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items] |  |  |
Total liabilities under Deferred Plan | 13,397 | 10,037 |
Deferred compensation matching contributions | 201 | 213 | 179
Deferred compensation expense |  | $ 487 | $ 20
First 3% [Member] | 401(k) Plan [Member] |  |  |
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items] |  |  |
Employer matching contribution, percentage | 100.00% |  |
Percentage of employees' gross pay for which the employer contributes a matching contribution | 3.00% |  |
First 3% [Member] | Deferred Plan [Member] |  |  |
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items] |  |  |
Employer matching contribution, percentage | 100.00% |  |
Percentage of employees' gross pay for which the employer contributes a matching contribution under the Deferred Plan | 3.00% |  |
Next 2% [Member] | 401(k) Plan [Member] |  |  |
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items] |  |  |
Employer matching contribution, percentage | 50.00% |  |
Percentage of employees' gross pay for which the employer contributes a matching contribution | 2.00% |  |
Next 2% [Member] | Deferred Plan [Member] |  |  |
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items] |  |  |
Employer matching contribution, percentage | 50.00% |  |
Percentage of employees' gross pay for which the employer contributes a matching contribution under the Deferred Plan | 2.00% |  |

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- Definition The compensation expense recognized during the period pertaining to the deferred compensation arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 710 -SubTopic 10 -Section 30 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6409875&loc=d3e20015-108363 + Details
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- Definition Aggregate carrying value as of the balance sheet date of the liabilities for all deferred compensation arrangements payable beyond one year (or the operating cycle, if longer). + References No definition available. + Details
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- Definition Number of shares issued during the period as a result of an employee stock purchase plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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