UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 4,663	$ 7,348	$ 13,716	$ 21,835
Other comprehensive income/(loss); change in funded status of pension plan	0	0	0	0
Comprehensive income	$ 4,663	$ 7,348	$ 13,716	$ 21,835