Segment Information, Reconciliation of Total Segment Profits to Consolidated Totals (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Reconciliation of total segment profits to the Company's consolidated totals [Abstract]
Net income	$ 1,958	$ 1,766	$ 28,532	$ 25,802
Net loss attributable to non-controlling interest in subsidiaries	(334)	(150)	(669)	(156)
Net income attributable to controlling interest	2,292	1,916	29,201	25,958
Reportable Segments [Member]
Reconciliation of total segment profits to the Company's consolidated totals [Abstract]
Net income	994	2,978	28,564	28,270
Intersegment Eliminations [Member]
Reconciliation of total segment profits to the Company's consolidated totals [Abstract]
Net income	$ 964	$ (1,212)	$ (32)	$ (2,468)