Schedule II - Condensed Financial Information of the Registrant (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Assets
Investments in consolidated affiliates	$ 21,142	$ 17,602
Other	13,469	14,306
Total assets	1,758,246	1,703,869
Liabilities
Total liabilities	1,087,520	1,059,370
Shareholders' equity	670,726	644,499	$ 708,283	$ 695,187
Total liabilities and shareholders' equity	1,758,246	1,703,869
Registrant
Assets
Investments in consolidated affiliates	672,102	645,701
Other	24	87
Total assets	672,126	645,788
Liabilities
Accounts payable and other liabilities	1,400	1,289
Total liabilities	1,400	1,289
Shareholders' equity	670,726	644,499
Total liabilities and shareholders' equity	$ 672,126	$ 645,788