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Operations and Summary of Significant Accounting Policies Recently Adopted Accounting Standards (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Jan. 01, 2016
New Accounting Pronouncement, Early Adoption [Line Items] |  |  |  |
Cash paid on behalf of employees for shares withheld | $ 5,341 | $ 4,018 | $ 3,716 |
Deferred Income Tax and Other Long-term Liabilities [Member] |  |  |  |
New Accounting Pronouncement, Early Adoption [Line Items] |  |  |  |
Increase (decrease) deferred income taxes |  | 12,100 |  |
Deferred tax liabilities, net, noncurrent |  | 16,500 |  | $ 4,400
Other Noncurrent Assets [Member] |  |  |  |
New Accounting Pronouncement, Early Adoption [Line Items] |  |  |  |
Deferred tax assets, net, noncurrent |  | 6,700 |  | 10,800
New Accounting Pronouncement, Early Adoption, Effect [Member] |  |  |  |
New Accounting Pronouncement, Early Adoption [Line Items] |  |  |  |
Deferred tax assets, net, current |  |  |  | $ (4,100)
Accounting Standards Update 2016-09 [Member] |  |  |  |
New Accounting Pronouncement, Early Adoption [Line Items] |  |  |  |
Excess tax benefit | 1,100 |  |  |
Cash paid on behalf of employees for shares withheld | $ 1,300 | $ 4,300 |  |

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