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Fair Value Measurements (Tables)
 12 Months Ended
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