Long-Term Investments (Cost-Method Investments) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($) investment	Dec. 31, 2014 USD ($)
Schedule of Cost-method Investments [Line Items]
Cost-method investments, carrying value	$ 35,476	$ 41,231
Cost-method investments, fair value	41,063	44,769
Cash distributions from cost method investments	4,741	587	$ 549
Purchase of long-term investments	50	$ 10,000	$ 12,000
Number of investments in funds | investment		3
Reinsurance Company
Schedule of Cost-method Investments [Line Items]
Purchase of long-term investments		$ 5,000
Investment partnerships
Schedule of Cost-method Investments [Line Items]
Cost-method investments, carrying value	34,975	40,730
Cost-method investments, fair value	40,569	44,217
Investment partnerships | Reinsurance Company
Schedule of Cost-method Investments [Line Items]
Purchase of long-term investments		5,000
Real estate partnership
Schedule of Cost-method Investments [Line Items]
Cost-method investments, carrying value	501	501
Cost-method investments, fair value	$ 494	$ 552