Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Goodwill (Details) - USD ($)		9 Months Ended
Goodwill (Details) - USD ($)	Aug. 31, 2016	Sep. 30, 2017	Dec. 31, 2016
Goodwill [Line Items]
Goodwill		$ 1,134,568,000	$ 1,133,534,000
Goodwill impairment		$ 0
Talmer
Goodwill [Line Items]
Goodwill acquired during period	$ 847,701,000