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Basis of Presentation and Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Supplemental Schedule of Non-Cash Investing and Financing Activities | Consolidated Statements of Cash Flows - Supplemental Schedule of Non-Cash Investing and Financing Activities
| Year Ended December 31,
| 2017 |  | 2016 |  | 2015
| (in thousands)
Accrued purchases of property, equipment, and software | $ | 2,195 |  |  | $ | 2,728 |  |  | $ | 851 |
Accretion of dividend equivalents | 3,532 |  |  | 3,244 |  |  | 2,978 |
Vendor financed insurance premiums | 1,450 |  |  | 2,082 |  |  | — |
Fair Value Measurements, Valuation Techniques | The three levels of the hierarchy and the related inputs are as follows:
Level |  | Inputs |  |  |
1 |  | Unadjusted quoted prices in active markets for identical assets and liabilities.
2 |  | Unadjusted quoted prices in active markets for similar assets and liabilities;
|  | Unadjusted quoted prices for identical or similar assets or liabilities in markets that are not active; or
|  | Inputs other than quoted prices that are observable for the asset or liability.
3 |  | Unobservable inputs for the asset or liability.

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- Definition Tabular disclosure of the inputs and valuation techniques used to measure fair value, and a discussion of changes in valuation techniques and related inputs, if any, applied during the period to each separate class of assets, liabilities, and financial instruments classified in shareholders' equity that are measured on a recurring and/or nonrecurring basis. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of supplemental cash flow information for the periods presented. + References No definition available. + Details
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