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Cash, Cash Equivalents and Marketable Securities (Tables) | 12 Months Ended
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Dec. 31, 2014
Cash, Cash Equivalents and Marketable Securities [Abstract] |
Summary of investments in cash, cash equivalents and marketable securities | The following table summarizes our investments in cash equivalents and marketable securities held by investment managers and overnight investments:
|  | December 31,
|  | 2014 |  | 2013
|  | (in thousands)
Overnight holdings: |  |  |  |
Money market funds (cash equivalents) |  | $ | 271,840 |  |  | $ | 192,040 |
Investment holdings: |  |  |  |  |  |
Money market funds (cash equivalents) |  | 14,125 |  |  | 42,913 |
Marketable securities |  | 28,631 |  |  | 46,340 |
|  | 314,596 |  |  | 281,293 |
Cash held in demand accounts |  | 20,369 |  |  | 23,054 |
Outstanding checks |  | (29,878 | ) |  | (32,252 | )
Total cash, cash equivalents and marketable securities |  | $ | 305,087 |  |  | $ | 272,095 |
Cash and cash equivalents |  | $ | 276,456 |  |  | $ | 225,755 |
Marketable securities |  | 28,631 |  |  | 46,340 |
|  | $ | 305,087 |  |  | $ | 272,095 |
Summary of fair value measurements of financial assets | The following tables summarize the levels of fair value measurements of our financial assets:
|  | Fair Value Measurements
|  |  |  | (in thousands) |  |
|  | December 31, 2014 |  | Level 1 |  | Level 2 |  | Level 3
Money market funds |  | $ | 285,965 |  |  | $ | 285,965 |  |  | $ | — |  |  | $ | — |
Municipal bonds |  | 28,631 |  |  | — |  |  | 28,631 |  |  | — |
Total |  | $ | 314,596 |  |  | $ | 285,965 |  |  | $ | 28,631 |  |  | $ | — |
|  | Fair Value Measurements
|  |  |  | (in thousands) |  |
|  | December 31, 2013 |  | Level 1 |  | Level 2 |  | Level 3
Money market funds |  | $ | 234,953 |  |  | $ | 234,953 |  |  | $ | — |  |  | $ | — |
Municipal bonds |  | 46,340 |  |  | — |  |  | 46,340 |  |  | — |
Total |  | $ | 281,293 |  |  | $ | 234,953 |  |  | $ | 46,340 |  |  | $ | — |
Summary of available-for-sale securities | The following is a summary of our available-for-sale marketable securities:
|  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value
|  |  |  | (in thousands) |  |
December 31, 2014 |  |  |  |  |  |  |  |
Municipal bonds |  | $ | 28,626 |  |  | $ | 16 |  |  | $ | (11 | ) |  | $ | 28,631 |
December 31, 2013 |  |  |  |  |  |  |  |  |  |  |  |
Municipal bonds |  | $ | 46,290 |  |  | $ | 51 |  |  | $ | (1 | ) |  | $ | 46,340 |
Contractual maturities of marketable securities | As of December 31, 2014, the contractual maturities of our marketable securities were as follows:
|  | Amortized Cost |  | Estimated Fair Value
|  | (in thousands)
Less than one year |  | $ | 12,728 |  |  | $ | 12,737 |
One to five years |  | 15,898 |  |  | 15,894 |
Total |  | $ | 28,626 |  |  | $ | 28,631 |

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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 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 Reference 2: 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=27724398&loc=d3e27357-111563 Reference 3: 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=27724398&loc=d3e27337-111563 Reference 4: 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=6957658&loc=d3e62557-112803 Reference 5: 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=27724398&loc=d3e27198-111563 Reference 6: 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=6957658&loc=d3e62586-112803 Reference 7: 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=27724398&loc=d3e27161-111563 + Details
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- Definition The entire disclosure for cash and cash equivalent footnotes, which may include the types of deposits and money market instruments, applicable carrying amounts, restricted amounts and compensating balance arrangements. Cash and equivalents include: (1) currency on hand (2) demand deposits with banks or financial institutions (3) other kinds of accounts that have the general characteristics of demand deposits (4) short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Generally, only investments maturing within three months from the date of acquisition qualify. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4273-108586 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 6.H.3) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13728-122682 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section H -Subsection 3 + 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 1 -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19190-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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- 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
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