Commitments and Contingencies (Warranties) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Changes in the activity related to liability recorded in connection with representations and warranties
Beginning reserve balance	$ 4,048	$ 3,000	$ 1,600
Addition of fair value of representations and warranties due to acquisitions	3,100	1,712	2,000
Reserve reduction	(580)	0	(287)
Charge-offs	(109)	(664)	(313)
Ending reserve balance	6,459	4,048	3,000
Liability for specific claims				$ 730	$ 0	$ 118
General allowance				5,729	4,048	2,882
Total reserve balance	$ 4,048	$ 3,000	$ 1,600	$ 6,459	$ 4,048	$ 3,000