Segment Information (Operating Income Reconciliation ) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Reconciliation of total operating income to the consolidated statement of income
Operating income	$ 4,500	$ 5,919
Income before income tax provision	260	1,589
Operating segment
Reconciliation of total operating income to the consolidated statement of income
Operating income	4,500	5,919
Corporate other expense	(4,240)	(4,330)
Income before income tax provision	$ 260	$ 1,589