Schedule II - Condensed Financial Information of Registrant (Parent Company Only) (Balance Sheet Extra) (Details) - USD ($) $ / shares in Units, $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Unamortized debt issuance cost (in dollars)	$ 1,001	$ 1,053
Common stock, par value (in dollars per share)	$ 0.18	$ 0.18
Common stock, authorized shares	33,333,333	33,333,333
Common stock, issued shares	20,872,831	20,872,831
Treasury stock, shares	2,260,849	1,775,512
Parent Company [Member]
Unamortized debt issuance cost (in dollars)	$ 1,001	$ 1,053
Common stock, par value (in dollars per share)	$ 0.18	$ 0.18
Common stock, authorized shares	33,333,333	33,333,333
Common stock, issued shares	20,872,831	20,872,831
Treasury stock, shares	2,260,849	1,775,512