Business Combinations (Details) - USD ($) $ in Thousands	2 Months Ended	12 Months Ended
	Mar. 13, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Business acquisition [Line Items]
Investments in businesses		$ 4,888	$ 4,149	$ 12,853
Liabilities assumed		216	0	1,078
Debt issued		875	1,500	2,080
Goodwill acquired during period		817	1,410	4,624
Goodwill acquired during period, tax deductible amount		$ 817	$ 1,410	$ 4,624
Subsequent event [Member]
Business acquisition [Line Items]
Investments in businesses	$ 975
Liabilities assumed	0
Debt issued	$ 375