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Subsequent Events Subsequent Events	9 Months Ended
Subsequent Events Subsequent Events	Sep. 30, 2017
Subsequent Event [Line Items]
Subsequent Events [Text Block]	Subsequent Events Lightower Acquisition On November 1, 2017, the Company closed the Lightower Acquisition. See note 3 for further discussion of the Lightower Acquisition. Common Stock Dividend On October 15, 2017, the Company's board of directors declared a quarterly common stock cash dividend of $1.05 per share. The common stock dividend will be paid on December 29, 2017 to common stockholders of record as of December 15, 2017.