Nature of Operations and Summary of Significant Accounting Policies (Details 3) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Maturities of marketable securities
Year 2016	$ 231,298
Years 2017 through 2020	55,370
Marketable securities	$ 286,700	$ 415,300
Maximum period for redemption	1 year
Investment as non-current	$ 2,300	2,300
Total cash and cash equivalents	203,035	132,275	$ 170,636	$ 133,772
Amortized Cost	286,887	415,726
Gross unrealized holding gains	1	12
Gross unrealized holding losses	(220)	(465)
Marketable securities	286,668	415,273
Total cash and cash equivalents and available for sale securities, amortized cost	489,922	548,001
Total cash and cash equivalents and available for sale securities, fair market value	489,703	547,548
Bonds and bond funds
Maturities of marketable securities
Amortized Cost	286,857	410,618
Gross unrealized holding gains		9
Gross unrealized holding losses	(220)	(464)
Marketable securities	286,637	410,163
Asset-backed Securities
Maturities of marketable securities
Amortized Cost	30	5,108
Gross unrealized holding gains	1	3
Gross unrealized holding losses		(1)
Marketable securities	$ 31	$ 5,110

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Amount of investment in cash and cash equivalents and debt and equity securities categorized neither as held-to-maturity nor trading.

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Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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Investments in debt and equity securities which are categorized neither as held-to-maturity nor trading and which are intended to be sold or mature more than one year from the balance sheet date or operating cycle, if longer. Such securities are reported at fair value; unrealized gains (losses) related to Available-for-sale Securities are excluded from earnings and reported in a separate component of shareholders' equity (other comprehensive income), unless the Available-for-sale security is designated as a hedge or is determined to have had an other than temporary decline in fair value below its amortized cost basis. All or a portion of the unrealized holding gain (loss) of an Available-for-sale security that is designated as being hedged in a fair value hedge is recognized in earnings during the period of the hedge, as are other than temporary declines in fair value below the cost basis for investments in equity securities and debt securities that an entity intends to sell or it is more likely than not that it will be required to sell before the recovery of its amortized cost basis. Other than temporary declines in fair value below the cost basis for debt securities categorized as Available-for-sale that an entity does not intend to sell and for which it is not more likely than not that the entity will be required to sell before the recovery of its amortized cost basis are bifurcated into credit losses and losses related to all other factors. Other than temporary declines in fair value below cost basis related to credit losses are recognized in earnings, and losses related to all other factors are recognized in other comprehensive income.

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes 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. Excludes cash and cash equivalents within disposal group and discontinued operation.

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