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Short-Term And Long-Term Investments And Restricted Deposits (Tables)
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12 Months Ended |
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Dec. 31, 2013
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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 and restricted deposits by investment type consist of the following: | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | December 31, 2013 | | December 31, 2012 | | 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 | $ | 246,085 |
| | $ | 245 |
| | $ | (7,494 | ) | | $ | 238,836 |
| | $ | 110,941 |
| | $ | 581 |
| | $ | (221 | ) | | $ | 111,301 |
| Corporate securities | 293,912 |
| | 2,782 |
| | (608 | ) | | 296,086 |
| | 290,691 |
| | 4,615 |
| | (195 | ) | | 295,111 |
| Restricted certificates of deposit | 5,891 |
| | — |
| | — |
| | 5,891 |
| | 5,890 |
| | — |
| | — |
| | 5,890 |
| Restricted cash equivalents | 26,642 |
| | — |
| | — |
| | 26,642 |
| | 14,455 |
| | — |
| | — |
| | 14,455 |
| Municipal securities: | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| General obligation | 54,003 |
| | 555 |
| | (136 | ) | | 54,422 |
| | 85,440 |
| | 1,157 |
| | (26 | ) | | 86,571 |
| Pre-refunded | 10,835 |
| | 82 |
| | — |
| | 10,917 |
| | 5,337 |
| | 85 |
| | — |
| | 5,422 |
| Revenue | 68,801 |
| | 545 |
| | (292 | ) | | 69,054 |
| | 82,781 |
| | 1,313 |
| | (30 | ) | | 84,064 |
| Variable rate demand notes | 28,575 |
| | — |
| | — |
| | 28,575 |
| | 23,385 |
| | — |
| | — |
| | 23,385 |
| Asset backed securities | 138,803 |
| | 579 |
| | (332 | ) | | 139,050 |
| | 73,570 |
| | 1,082 |
| | (15 | ) | | 74,637 |
| Mortgage backed securities | 33,974 |
| | — |
| | (83 | ) | | 33,891 |
| | — |
| | — |
| | — |
| | — |
| Cost and equity method investments | 22,239 |
| | — |
| | — |
| | 22,239 |
| | 11,298 |
| | — |
| | — |
| | 11,298 |
| Life insurance contracts | 15,369 |
| | — |
| | — |
| | 15,369 |
| | 15,023 |
| | — |
| | — |
| | 15,023 |
| Total | $ | 945,129 |
| | $ | 4,788 |
| | $ | (8,945 | ) | | $ | 940,972 |
| | $ | 718,811 |
| | $ | 8,833 |
| | $ | (487 | ) | | $ | 727,157 |
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| Schedule Of Available-For-Sale Investments In A Continuous Unrealized Loss Position |
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: | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | December 31, 2013 | | December 31, 2012 | | 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 | $ | (6,188 | ) | | $ | 172,365 |
| | $ | (1,307 | ) | | $ | 26,454 |
| | $ | (219 | ) | | $ | 56,033 |
| | $ | (2 | ) | | $ | 201 |
| Corporate securities | (400 | ) | | 52,725 |
| | (207 | ) | | 5,020 |
| | (195 | ) | | 44,208 |
| | — |
| | — |
| Municipal securities: | |
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| | |
| | |
| | |
| | |
| | |
| | |
| General obligation | (72 | ) | | 3,480 |
| | (63 | ) | | 2,426 |
| | (26 | ) | | 7,930 |
| | — |
| | — |
| Revenue | (292 | ) | | 27,789 |
| | — |
| | — |
| | (30 | ) | | 3,090 |
| | — |
| | — |
| Asset backed securities | (333 | ) | | 37,689 |
| | — |
| | — |
| | (15 | ) | | 8,192 |
| | — |
| | — |
| Mortgage backed securities | (83 | ) | | 33,891 |
| | — |
| | — |
| | — |
| | — |
| | — |
| | — |
| Total | $ | (7,368 | ) | | $ | 327,939 |
| | $ | (1,577 | ) | | $ | 33,900 |
| | $ | (485 | ) | | $ | 119,453 |
| | $ | (2 | ) | | $ | 201 |
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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: | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | December 31, 2013 | | December 31, 2012 | | 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 | $ | 101,537 |
| | $ | 102,126 |
| | $ | 40,633 |
| | $ | 40,637 |
| | $ | 136,997 |
| | $ | 138,101 |
| | $ | 33,897 |
| | $ | 33,928 |
| One year through five years | 609,755 |
| | 610,589 |
| | 6,301 |
| | 6,309 |
| | 429,053 |
| | 435,728 |
| | 358 |
| | 358 |
| Five years through ten years | 157,003 |
| | 151,221 |
| | — |
| | — |
| | 93,907 |
| | 93,778 |
| | — |
| | — |
| Greater than ten years | 29,900 |
| | 30,090 |
| | — |
| | — |
| | 24,599 |
| | 25,264 |
| | — |
| | — |
| Total | $ | 898,195 |
| | $ | 894,026 |
| | $ | 46,934 |
| | $ | 46,946 |
| | $ | 684,556 |
| | $ | 692,871 |
| | $ | 34,255 |
| | $ | 34,286 |
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