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Acquisition Level 1 (Notes)	12 Months Ended
Acquisition Level 1 (Notes)	Dec. 31, 2017
Business Combinations [Abstract]
Business Combination Disclosure [Text Block]	Acquisitions We spent $76.2 million, $72.9 million, and $68.9 million for several smaller, tuck-in acquisitions for the three years ended December 31, 2017, 2016, and 2015, respectively. These amounts include the use of $26.2 million, $3.7 million, and $27.7 million in 1031 exchange funds for the three years ended December 31, 2017, 2016, and 2015, respectively. Wilson Financial Group During the three years ended December 31, 2017, we spent a total of $8.6 million ($4.6 million in 2017, $1.9 million in 2016, and $2.1 million in 2015) to acquire the remaining 46% of common stock of our consolidated subsidiary, Wilson Financial Group, Inc.