Schedule I - Condensed Financial Information of the Parent (Textual) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Condensed Financial Statements, Captions [Line Items]
Cash and cash equivalents	$ 52,499	$ 61,135	$ 95,390	$ 139,855
Parent Company
Condensed Financial Statements, Captions [Line Items]
Unrestricted investment	12,000
Cash and cash equivalents	$ 22,506	$ 53,415	$ 94,035	$ 120,659