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Acquisitions and Divestitures Asset Acquisition - Pro Forma (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Business Acquisition, Pro Forma Revenue	$ 3,293,658	$ 3,262,273
Business Acquisition, Pro Forma Net Income (Loss)	$ 131,290	$ 172,462
Business Acquisition, Pro Forma Earnings Per Share, Basic	$ 1.15	$ 1.50
Business Acquisition, Pro Forma Earnings Per Share, Diluted	$ 1.14	$ 1.49
As Previously Reported [Member]
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Business Acquisition, Pro Forma Revenue	$ 2,626,730	$ 2,400,819
Business Acquisition, Pro Forma Net Income (Loss)	$ 114,701	$ 167,998
Business Acquisition, Pro Forma Earnings Per Share, Basic	$ 1.01	$ 1.46
Business Acquisition, Pro Forma Earnings Per Share, Diluted	$ 1.00	$ 1.45
Adjustments [Member]
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Business Acquisition, Pro Forma Revenue	$ 666,928	$ 861,454
Business Acquisition, Pro Forma Net Income (Loss)	$ 16,589	$ 4,464

X

- Definition

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.

+ References

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

+ References

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

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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+ References

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