Schedule II - Condensed Financial Information of Registrant (Parent Company Only) (Balance Sheet Extra) (Details) - $ / shares |
Dec. 31, 2015 |
Dec. 31, 2014 |
|---|---|---|
| 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 | 1,775,512 | 1,655,306 |
| Parent Company [Member] | ||
| 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 | 1,775,512 | 1,655,306 |