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Accumulated Other Comprehensive Income - AOCI Rollforward with Reclassification (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Jan. 01, 2018
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]          
Balance, beginning of period $ 26,603 $ 47,514 $ 24,258 $ 50,727  
Balance at January 1, 2018, as adjusted         $ 50,073
Other comprehensive (loss) income (591) 702 (1,431) (104)  
Balance, end of period 25,207 37,956 25,207 37,956  
Total Accumulated Other Comprehensive Income          
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]          
Balance, beginning of period 39,922 35,844 40,768 (3,852)  
Cumulative effect of adoption of ASU 2016-01         40,495
Balance at January 1, 2018, as adjusted         36,643
Other comprehensive income (loss) arising during the period (635) 706 (1,475) (86)  
Amounts reclassified from accumulated other comprehensive income 38 (4) 32 (11)  
Other comprehensive (loss) income (597) 702 (1,443) (97)  
Balance, end of period 39,325 36,546 39,325 36,546  
Unrealized Gains (Losses) on Available-for-Sale Investments          
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]          
Balance, beginning of period (61) (891) (160) (566)  
Cumulative effect of adoption of ASU 2016-01         40
Balance at January 1, 2018, as adjusted         (526)
Other comprehensive income (loss) arising during the period 115 (72) 220 (430)  
Amounts reclassified from accumulated other comprehensive income (7) (4) (13) (11)  
Other comprehensive (loss) income 108 (76) 207 (441)  
Balance, end of period 47 (967) 47 (967)  
Foreign Currency Translation Adjustments          
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]          
Balance, beginning of period (3,286) (3,286) (3,286) (3,286)  
Cumulative effect of adoption of ASU 2016-01         0
Balance at January 1, 2018, as adjusted         (3,286)
Other comprehensive income (loss) arising during the period 0 0 0 0  
Amounts reclassified from accumulated other comprehensive income 0 0 0 0  
Other comprehensive (loss) income 0 0 0 0  
Balance, end of period (3,286) (3,286) (3,286) (3,286)  
Change in Fair Value of Debt Attributable to Instrument-Specific Credit Risk          
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]          
Balance, beginning of period 43,314 40,021 44,259 0  
Cumulative effect of adoption of ASU 2016-01         40,455
Balance at January 1, 2018, as adjusted         $ 40,455
Other comprehensive income (loss) arising during the period (750) 778 (1,695) 344  
Amounts reclassified from accumulated other comprehensive income 0 0 0 0  
Other comprehensive (loss) income (750) 778 (1,695) 344  
Balance, end of period 42,564 $ 40,799 42,564 $ 40,799  
Equity in Other Comprehensive (Loss) Income of Limited Liability Investment          
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]          
Balance, beginning of period (45)   (45)    
Other comprehensive income (loss) arising during the period 0   0    
Amounts reclassified from accumulated other comprehensive income 45   45    
Other comprehensive (loss) income 45   45    
Balance, end of period $ 0   $ 0