Organization and Summary of Significant Accounting Policies Newly Adopted Accounting Pronouncements (Details) - Adjustments for New Accounting Pronouncement [Member] $ in Millions	12 Months Ended
	Dec. 31, 2017 USD ($) shares
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Excess tax benefits recognized as a result of the adoption | $	$ 12.6
Increase in diluted weighted average shares outstanding (in shares) | shares	550,000