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Short-Term And Long-Term Investments And Restricted Deposits (Tables)
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9 Months Ended |
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Sep. 30, 2014
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| Investments, Debt and Equity Securities [Abstract] |
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| Short-Term And Long-Term Investments And Restricted Deposits By Investment Type |
Short-term and Long-term Investments, Restricted Deposits
Short-term and long-term investments and restricted deposits by investment type consist of the following: | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | September 30, 2014 | | December 31, 2013 | | Amortized Cost | | Gross Unrealized Gains | | Gross Unrealized Losses | | Fair Value | | Amortized Cost | | Gross Unrealized Gains | | Gross Unrealized Losses | | Fair Value | U.S. Treasury securities and obligations of U.S. government corporations and agencies | $ | 329,439 |
| | $ | 246 |
| | $ | (4,273 | ) | | $ | 325,412 |
| | $ | 246,085 |
| | $ | 245 |
| | $ | (7,494 | ) | | $ | 238,836 |
| Corporate securities | 489,304 |
| | 2,815 |
| | (990 | ) | | 491,129 |
| | 293,912 |
| | 2,782 |
| | (608 | ) | | 296,086 |
| Restricted certificates of deposit | 5,892 |
| | — |
| | — |
| | 5,892 |
| | 5,891 |
| | — |
| | — |
| | 5,891 |
| Restricted cash equivalents | 78,995 |
| | — |
| | — |
| | 78,995 |
| | 26,642 |
| | — |
| | — |
| | 26,642 |
| Municipal securities: | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| General obligation | 49,467 |
| | 422 |
| | (14 | ) | | 49,875 |
| | 54,003 |
| | 555 |
| | (136 | ) | | 54,422 |
| Pre-refunded | 4,955 |
| | 46 |
| | (16 | ) | | 4,985 |
| | 10,835 |
| | 82 |
| | — |
| | 10,917 |
| Revenue | 100,312 |
| | 768 |
| | (58 | ) | | 101,022 |
| | 68,801 |
| | 545 |
| | (292 | ) | | 69,054 |
| Variable rate demand notes | 11,700 |
| | — |
| | — |
| | 11,700 |
| | 28,575 |
| | — |
| | — |
| | 28,575 |
| Asset backed securities | 185,270 |
| | 389 |
| | (143 | ) | | 185,516 |
| | 138,803 |
| | 579 |
| | (332 | ) | | 139,050 |
| Mortgage backed securities | 46,023 |
| | 753 |
| | — |
| | 46,776 |
| | 33,974 |
| | — |
| | (83 | ) | | 33,891 |
| Cost and equity method investments | 58,051 |
| | — |
| | — |
| | 58,051 |
| | 22,239 |
| | — |
| | — |
| | 22,239 |
| Life insurance contracts | 15,628 |
| | — |
| | — |
| | 15,628 |
| | 15,369 |
| | — |
| | — |
| | 15,369 |
| Total | $ | 1,375,036 |
| | $ | 5,439 |
| | $ | (5,494 | ) | | $ | 1,374,981 |
| | $ | 945,129 |
| | $ | 4,788 |
| | $ | (8,945 | ) | | $ | 940,972 |
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| Fair Value Of Available-For-Sale Investments With Gross Unrealized Losses By Investment Type And Length Of Time |
The fair value of available-for-sale investments with gross unrealized losses by investment type and length of time that individual securities have been in a continuous unrealized loss position were as follows: | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | September 30, 2014 | | December 31, 2013 | | Less Than 12 Months | | 12 Months or More | | Less Than 12 Months | | 12 Months or More | | Unrealized Losses | | Fair Value | | Unrealized Losses | | Fair Value | | Unrealized Losses | | Fair Value | | Unrealized Losses | | Fair Value | U.S. Treasury securities and obligations of U.S. government corporations and agencies | $ | (204 | ) | | $ | 62,910 |
| | $ | (4,069 | ) | | $ | 178,270 |
| | $ | (6,188 | ) | | $ | 172,365 |
| | $ | (1,307 | ) | | $ | 26,454 |
| Corporate securities | (972 | ) | | 195,027 |
| | (18 | ) | | 983 |
| | (400 | ) | | 52,725 |
| | (207 | ) | | 5,020 |
| Municipal securities: | |
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| | |
| | |
| | |
| | |
| | |
| General obligation | — |
| | — |
| | (14 | ) | | 3,456 |
| | (72 | ) | | 3,480 |
| | (63 | ) | | 2,426 |
| Pre-refunded | (16 | ) | | 1,022 |
| | — |
| | — |
| | — |
| | — |
| | — |
| | — |
| Revenue | (24 | ) | | 2,356 |
| | (34 | ) | | 3,395 |
| | (292 | ) | | 27,789 |
| | — |
| | — |
| Asset backed securities | (62 | ) | | 41,911 |
| | (81 | ) | | 10,046 |
| | (333 | ) | | 37,689 |
| | — |
| | — |
| Mortgage backed securities | — |
| | — |
| | — |
| | — |
| | (83 | ) | | 33,891 |
| | — |
| | — |
| Total | $ | (1,278 | ) | | $ | 303,226 |
| | $ | (4,216 | ) | | $ | 196,150 |
| | $ | (7,368 | ) | | $ | 327,939 |
| | $ | (1,577 | ) | | $ | 33,900 |
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| Contractual Maturities Of Short-Term And Long-Term Investments And Restricted Deposits |
The contractual maturities of short-term and long-term investments and restricted deposits are as follows: | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | September 30, 2014 | | December 31, 2013 | | Investments | | Restricted Deposits | | Investments | | Restricted Deposits | | Amortized Cost | | Fair Value | | Amortized Cost | | Fair Value | | Amortized Cost | | Fair Value | | Amortized Cost | | Fair Value | One year or less | $ | 166,251 |
| | $ | 166,993 |
| | $ | 91,716 |
| | $ | 91,731 |
| | $ | 101,537 |
| | $ | 102,126 |
| | $ | 40,633 |
| | $ | 40,637 |
| One year through five years | 953,321 |
| | 952,591 |
| | 7,999 |
| | 7,996 |
| | 609,755 |
| | 610,589 |
| | 6,301 |
| | 6,309 |
| Five years through ten years | 123,875 |
| | 123,175 |
| | — |
| | — |
| | 157,003 |
| | 151,221 |
| | — |
| | — |
| Greater than ten years | 31,874 |
| | 32,495 |
| | — |
| | — |
| | 29,900 |
| | 30,090 |
| | — |
| | — |
| Total | $ | 1,275,321 |
| | $ | 1,275,254 |
| | $ | 99,715 |
| | $ | 99,727 |
| | $ | 898,195 |
| | $ | 894,026 |
| | $ | 46,934 |
| | $ | 46,946 |
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