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Income Taxes - Additional Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities |  |  | $ 83,415 |
Provision for income taxes | $ 51,550 | $ 49,584 |  |
Income before provision for income taxes | $ 190,162 | $ 200,935 |  |
U.S. federal statutory rate |  |  | 21.00% | 35.00%
Effective Income Tax Rate Reconciliation, Other Adjustments, Percent | 1.00% |  |  |
Effective Income Tax Rate Reconciliation, Percent | 27.10% | 24.70% |  |
Deferred income taxes | $ 305,770 |  | $ 311,434 |
Excess Tax Benefit on Stock Based Payments |  | $ 3,000 |  |
Effective Income Tax Rate Reconciliation, Change as a result of the Discrete Items, Percent | 1.30% |  |  |
Stahlgruber [Member] |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities |  |  | $ 78,130 |

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- Definition Amount of realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes. + References No definition available. + Details
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- Definition Amount, after deferred tax asset, of deferred tax liability attributable to taxable differences, with jurisdictional netting and classified as noncurrent. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=84176650&loc=d3e31931-109318 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=84176650&loc=d3e31958-109318 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=84176650&loc=d3e31917-109318 + Details
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