XML 36 R25.htm IDEA: XBRL DOCUMENT
v3.7.0.1

INVESTMENTS (Tables) | 3 Months Ended
--- | ---
Mar. 31, 2017
INVESTMENTS |
Summary of investments in available-for-sale |
March 31, 2017 |  | Amortized Cost |  | Gross Unrealized Holding Gains |  | Gross Unrealized Holding Losses |  | Fair Value |  | Continuous Unrealized Loss Position less than 12 Months |  | Continuous Unrealized Loss Position greater than 12 Months
Available-for-sale |  |  |  |  |  |  |  |  |  |  |  |
Short-term: |  |  |  |  |  |  |  |  |  |  |  |
Commercial paper |  | $ | 50,623 |  | $ | - |  | $ | - |  | $ | 50,623 |  | $ | - |  | $ | -
Certificates of deposit |  | 3,164 |  | - |  | - |  | 3,164 |  | - |  | -
Municipal securities |  | 119,833 |  | 2 |  | 56 |  | 119,779 |  | 54 |  | -
U.S. government agency securities |  | 10,076 |  | - |  | 6 |  | 10,070 |  | 6 |  | -
Variable rate demand notes |  | 25,730 |  | - |  | - |  | 25,730 |  | - |  | -
Long-term: |  |  |  |  |  |  |  |  |  |  |  |
Municipal securities |  | 478 |  | - |  | 1 |  | 477 |  | 1 |  | -
Total |  | $ | 209,904 |  | $ | 2 |  | $ | 63 |  | $ | 209,843 |  | $ | 61 |  | $ | -
December 31, 2016 |  | Amortized Cost |  | Gross Unrealized Holding Gains |  | Gross Unrealized Holding Losses |  | Fair Value |  | Continuous Unrealized Loss Position less than 12 Months |  | Continuous Unrealized Loss Position greater than 12 Months
Available-for-sale |  |  |  |  |  |  |  |  |  |  |  |
Short-term: |  |  |  |  |  |  |  |  |  |  |  |
Commercial paper |  | $ | 40,382 |  | $ | - |  | $ | - |  | $ | 40,382 |  | $ | - |  | $ | -
Municipal securities |  | 140,379 |  | - |  | 181 |  | 140,198 |  | 181 |  | -
U.S. government agency securities |  | 26,057 |  | - |  | 6 |  | 26,051 |  | 6 |  | -
Variable rate demand notes |  | 13,923 |  | - |  | - |  | 13,923 |  | - |  | -
Long-term: |  |  |  |  |  |  |  |  |  |  |  |
Municipal securities |  | 2,403 |  | - |  | 9 |  | 2,394 |  | 9 |  | -
Total |  | $ | 223,144 |  | $ | - |  | $ | 196 |  | $ | 222,948 |  | $ | 196 |  | $ | -
Summarizes the underlying contractual maturities of the Company's investments |
|  | March 31, 2017 |  | December 31, 2016
|  | Amortized Cost |  | Fair Value |  | Amortized Cost |  | Fair Value
Less than 1 year: |  |  |  |  |  |  |  |
Commercial paper |  | $ | 50,623 |  | $ | 50,623 |  | $ | 40,382 |  | $ | 40,382
Certificates of deposit |  | 3,164 |  | 3,164 |  | - |  | -
Municipal securities |  | 119,833 |  | 119,779 |  | 140,379 |  | 140,198
U.S. government agency securities |  | 10,076 |  | 10,070 |  | 26,057 |  | 26,051
Due 1 -10 years: |  |  |  |  |  |  |  |
Municipal securities |  | 478 |  | 477 |  | 2,403 |  | 2,394
Variable rate demand notes |  | 3,917 |  | 3,917 |  | 3,917 |  | 3,917
Due 11 - 20 years: |  |  |  |  |  |  |  |
Variable rate demand notes |  | 13,808 |  | 13,808 |  | 6,003 |  | 6,003
Due 21 - 30 years: |  |  |  |  |  |  |  |
Variable rate demand notes |  | 4,002 |  | 4,002 |  | 4,003 |  | 4,003
Due 31 - 40 years: |  |  |  |  |  |  |  |
Variable rate demand notes |  | 4,003 |  | 4,003 |  | - |  | -
Total |  | $ | 209,904 |  | $ | 209,843 |  | $ | 223,144 |  | $ | 222,948

X
- Definition Tabular disclosure of maturities of an entity's investments as well as any other information pertinent to the investments. + References No definition available. + Details
Name: | us-gaap_InvestmentsClassifiedByContractualMaturityDateTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_InvestmentsDebtAndEquitySecuritiesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of unrealized gains and losses on investments. + References No definition available. + Details
Name: | us-gaap_UnrealizedGainLossOnInvestmentsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration