Schedule I - Condensed Financial Information of the Parent (Textual) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Condensed Financial Statements, Captions [Line Items]
Cash and cash equivalents	$ 80,648	$ 52,499	$ 61,135	$ 95,390
Parent Company
Condensed Financial Statements, Captions [Line Items]
Unrestricted investment	400
Cash and cash equivalents	$ 57,917	$ 22,506	$ 53,415	$ 94,035