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Income Taxes (Schedule of Income Taxes Reconciliation) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Tax Disclosure [Abstract] |  |  |
Income tax at federal statutory rate | $ 40,394 | $ 74,495 | $ 69,710
State income tax, net of federal income tax impact | 6,261 | 6,011 | 6,480
Foreign tax rate differential | (598) | (322) | (614)
Section 162(m) permanent addback | 894 | 0 | 0
Domestic production deduction | 0 | (5,511) | (5,067)
Share-based payment compensation excess tax benefit | (2,914) | (7,683) | 0
Federal tax credits | (1,876) | (1,110) | (1,736)
Changes in tax law (TCJA) | 612 | 13,210 | 0
Other | 1,028 | 870 | 728
Provision for income taxes | $ 43,801 | $ 79,960 | $ 69,501

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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations, attributable to increase (decrease) in the income tax rates. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=84176650&loc=d3e32059-109318 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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