SCHEDULE I - CONDENSED FINANCIAL INFORMATION (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Assets [Abstract]
TOTAL ASSETS	$ 983,263	$ 965,844
Liabilities and Stockholder's Equity
Income taxes payable	5,931	3,121
Total liabilities	567,183	630,699
Total stockholders’ equity	407,637	335,145
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	983,263	965,844
Parent Company
Assets [Abstract]
Accounts receivable from subsidiary	101,504	4,114
Investment in subsidiaries	342,810	333,003
Claims for income tax refunds	(16)	16
Deferred income tax asset	(24)	0
TOTAL ASSETS	444,274	337,133
Liabilities and Stockholder's Equity
Accounts payable to subsidiaries	1,909	1,909
Income taxes payable	26,285	0
Total liabilities	28,194	1,909
Total stockholders’ equity	416,080	335,224
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$ 444,274	$ 337,133