Business Combinations (Pro Forma Impact of Acquisitions) (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016
Business Combinations [Abstract]
Revenues	$ 567,985	$ 547,381
Net income	236,461	234,307
Net income attributable to common shareholders - basic	198,563	213,920
Net income attributable to common shareholders - diluted	$ 200,559	$ 215,823
Earnings per share – basic (usd per share)	$ 1.58	$ 1.74
Earnings per share – diluted (usd per share)	$ 1.56	$ 1.72

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/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(2)-(3)
-URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463

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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.

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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.

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The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period.

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