Income Taxes Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Deferred tax assets, net of valuation allowance
Net operating loss	$ 126,037	$ 110,904
Deferred compensation	44,966	65,162
Goodwill	4,758	7,009
Fixed assets	3,541	2,003
Tax credits	2,898	1,630
Acquired lease liability	4,111	4,843
Other	2,238	2,317
Valuation allowance	188,549	193,868
Valuation allowance	2,119	0
Deferred tax assets, net of valuation allowance	186,430	193,868
Deferred tax liabilities
Basis difference on investments	0	15,352
Unrealized gains on investments	20,774	34,613
Intangible assets	0	296
Other	0	47
Total deferred tax liabilities	20,774	50,308
Deferred tax assets/(liabilities), net	$ 165,656	$ 143,560