Acquisitions - Pro Forma Information (Details) - Washington Acquisition $ / shares in Units, $ in Thousands	6 Months Ended
Jun. 30, 2019 USD ($) $ / shares
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Revenues \| $	$ 2,628,652
Net income (loss), net of tax \| $	$ 10,035
Pro forma earnings per share, basic, net of tax (in dollars per share)	$ 0.20
Pro forma earnings per share, diluted, net of tax (in dollars per share)	$ 0.20
Pro forma net income (loss) \| $	$ 77,700
Pro forma earnings per share, basic (in shares)	$ 1.55
Pro forma earnings per share, diluted (in shares)	$ 1.54

The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(3)
-URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463

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Per basic share amount of pro forma income from continuing operations, after tax, as if the business combination had been completed at the beginning of a period.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
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Amount after tax of pro forma income from continuing operations as if the business combination had been completed at the beginning of a period.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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