Business combinations (Tables)

12 Months Ended

Dec. 31, 2016

Business Combinations [Abstract]

Estimated Amortization of Intangible Assets

The estimated amortization of intangible assets for the year ended December 31, 2016 and for each of the five succeeding years and thereafter is as follows (in thousands):

2017	$	3,763
2018		3,763
2019		3,763
2020		3,763
2021		3,763
2022		1,879
Total	$	20,694