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Fair Value Measurements (Tables) | 12 Months Ended
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Dec. 31, 2017
Fair Value Disclosures [Abstract] |
Fair Value Measurements | The following tables provide fair value measurement information for the Company’s marketable securities and deferred compensation fund investment assets as of December 31, 2017 and 2016:
| As of December 31, 2017
|  |  |  |  | Fair Value Measurement Using:
| Carrying Amount |  | Total Fair Value |  | Quoted Prices in Active Markets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3)
| (in thousands)
Financial Assets: |  |  |  |  |  |  |  |  |
Marketable securities |  |  |  |  |  |  |  |  |
Municipal bonds — available-for-sale | $ | 73,221 |  |  | $ | 73,221 |  |  | $ | — |  |  | $ | 73,221 |  |  | $ | — |
Deferred compensation fund |  |  |  |  |  |  |  |  |
Money Market (1) | $ | 2,720 |  |  | $ | 2,720 |  |  | $ | — |  |  | $ | 2,720 |  |  | $ | — |
Balanced and Lifestyle | 8,523 |  |  | 8,523 |  |  | 8,523 |  |  | — |  |  | — |
Large Cap Growth | 7,802 |  |  | 7,802 |  |  | 7,802 |  |  | — |  |  | — |
Small Cap Growth | 3,442 |  |  | 3,442 |  |  | 3,442 |  |  | — |  |  | — |
Fixed Income | 3,050 |  |  | 3,050 |  |  | 3,050 |  |  | — |  |  | — |
International | 1,531 |  |  | 1,531 |  |  | 1,531 |  |  | — |  |  | — |
Mid Cap Growth | 1,817 |  |  | 1,817 |  |  | 1,817 |  |  | — |  |  | — |
Deferred compensation fund | $ | 28,885 |  |  | $ | 28,885 |  |  | $ | 26,165 |  |  | $ | 2,720 |  |  | $ | — |
| As of December 31, 2016
|  |  |  |  | Fair Value Measurement Using:
| Carrying Amount |  | Total Fair Value |  | Quoted Prices in Active Markets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3)
| (in thousands)
Financial Assets: |  |  |  |  |  |  |  |  |
Marketable securities |  |  |  |  |  |  |  |  |
Municipal bonds — available-for-sale | $ | 67,730 |  |  | $ | 67,730 |  |  | $ | — |  |  | $ | 67,730 |  |  | $ | — |
Deferred compensation fund |  |  |  |  |  |  |  |  |
Money Market (1) | $ | 3,147 |  |  | $ | 3,147 |  |  | $ | — |  |  | $ | 3,147 |  |  | $ | — |
Balanced and Lifestyle | 7,162 |  |  | 7,162 |  |  | 7,162 |  |  | — |  |  | — |
Large Cap Growth | 5,583 |  |  | 5,583 |  |  | 5,583 |  |  | — |  |  | — |
Small Cap Value | 2,933 |  |  | 2,933 |  |  | 2,933 |  |  | — |  |  | — |
Fixed Income | 2,752 |  |  | 2,752 |  |  | 2,752 |  |  | — |  |  | — |
International | 1,132 |  |  | 1,132 |  |  | 1,132 |  |  | — |  |  | — |
Mid Cap Growth | 1,410 |  |  | 1,410 |  |  | 1,410 |  |  | — |  |  | — |
Deferred compensation fund | $ | 24,119 |  |  | $ | 24,119 |  |  | $ | 20,972 |  |  | $ | 3,147 |  |  | $ | — |
(1) The fair value of the money market fund is based on the net asset value (“NAV”) of the shares held by the plan at the end of the period. The money market fund includes short-term United States dollar denominated money-market instruments and the NAV is determined by the custodian of the fund. The money market fund can be redeemed at its NAV at the measurement date, as there are no significant restrictions on the ability to sell this investment.
Marketable Debt Securities |
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value |  | Other-Than-Temporary Impairments
| (in thousands)
December 31, 2017 |  |  |  |  |  |  |  |  |
Marketable securities |  |  |  |  |  |  |  |  |
Municipal bonds — available-for-sale | $ | 72,249 |  |  | $ | 1,169 |  |  | $ | (197 | ) |  | $ | 73,221 |  |  | $ | — |
Total debt securities | $ | 72,249 |  |  | $ | 1,169 |  |  | $ | (197 | ) |  | $ | 73,221 |  |  | $ | — |
December 31, 2016 |  |  |  |  |  |  |  |  |
Marketable securities |  |  |  |  |  |  |  |  |
Municipal bonds — available-for-sale | $ | 68,220 |  |  | $ | 178 |  |  | $ | (668 | ) |  | $ | 67,730 |  |  | $ | — |
Total debt securities | $ | 68,220 |  |  | $ | 178 |  |  | $ | (668 | ) |  | $ | 67,730 |  |  | $ | — |
December 31, 2015 |  |  |  |  |  |  |  |  |
Marketable securities |  |  |  |  |  |  |  |  |
Municipal bonds — available-for-sale | $ | 68,640 |  |  | $ | 869 |  |  | $ | (13 | ) |  | $ | 69,496 |  |  | $ | — |
Total debt securities | $ | 68,640 |  |  | $ | 869 |  |  | $ | (13 | ) |  | $ | 69,496 |  |  | $ | — |
Contractual Maturities of Available For Sale Investments | The following table summarizes the contractual maturities of debt securities held at December 31, 2017 and 2016, which are classified as marketable securities in the Consolidated Balance Sheets:
| Municipal Bonds — Available-for-Sale
| December 31,
| 2017 |  | 2016
| (in thousands)
Contractual maturity: |  |  |
Maturing in one year or less | $ | 916 |  |  | $ | 973 |
Maturing in second year through fifth year | 15,948 |  |  | 28,671 |
Maturing in sixth year through tenth year | 22,851 |  |  | 21,651 |
Maturing after ten years | 33,506 |  |  | 16,435 |
Total debt securities | $ | 73,221 |  |  | $ | 67,730 |

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- Definition Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=75019621&loc=d3e62557-112803 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27198-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=75019621&loc=d3e62586-112803 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27357-111563 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 + Details
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- Definition Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + 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 (b) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of marketable securities. This may consist of investments in certain debt and equity securities, short-term investments and other assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26626-111562 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.4) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26610-111562 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2,12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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