Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Net income	$ 9,532	$ 6,771	$ 22,899	$ 19,712
Other comprehensive income (loss), net of tax:
Change in equity method investments	0	0	(4)	45
Other comprehensive income (loss)	(17)	(15)	(56)	243
Comprehensive income	9,515	6,756	22,843	19,955
Change in pension plans
Other comprehensive income (loss), net of tax:
Company sponsored benefit plans:	0	0	0	243
Change in post-employment benefits
Other comprehensive income (loss), net of tax:
Company sponsored benefit plans:	$ (17)	$ (15)	$ (52)	$ (45)