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Shareholders' Equity	12 Months Ended
	Dec. 31, 2017
Stockholders' Equity Note [Abstract]
Shareholders' Equity	Shareholders’ Equity During the years ended December 31, 2017 and 2016, we repurchased and contemporaneously retired 158,202 and 311,022 shares of our common stock at an aggregate cost of $389,000 and $949,000, respectively, pursuant to both open market and private purchases and the return of stock by holders of equity incentive awards to pay tax withholding obligations. We had 1,459,233 loaned shares outstanding at December 31, 2017 and December 31, 2016, which were originally lent in connection with our November 2005 issuance of convertible senior notes. We retire lent shares as they are returned to us.

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- Definition

The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-URI http://asc.fasb.org/topic&trid=2208762

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