General and Summary of Significant Accounting Policies New Accounting Pronouncements (Details) - USD ($) $ in Thousands |
12 Months Ended | ||
---|---|---|---|
Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
|
New Accounting Pronouncements or Change in Accounting Principle [Line Items] | |||
Employee Service Share-based Compensation, Tax Benefit Realized from Exercise of Stock Options | $ 7,556 | $ 9,330 | $ 5,700 |