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Recently Issued Accounting Standards (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Adoption of New Accounting Pronouncements [Abstract]          
Federal corporate tax rate     21.00% 35.00% 35.00%
Reduction in tax rate     14.00%    
Classified distributions from equity method investees as cash flows from operating activities     $ 202 $ 58  
Cash flows from investing activities     (9,719) 5,678  
Cash flows from operating activities     (6,396) (5,702)  
Revenues within scope of updated accounting guidance $ 49,443 $ 43,632 89,983 87,491  
ASU 2018-02 [Member]          
Adoption of New Accounting Pronouncements [Abstract]          
Reclassification of standard tax effects on AOCI and retained earnings         $ 0
ASU 2018-02 [Member] | Retained Earnings [Member]          
Adoption of New Accounting Pronouncements [Abstract]          
Reclassification of standard tax effects on AOCI and retained earnings         (2,100)
ASU 2018-02 [Member] | Accumulated Other Comprehensive Income [Member]          
Adoption of New Accounting Pronouncements [Abstract]          
Reclassification of standard tax effects on AOCI and retained earnings         2,100
ASU 2016-15 [Member]          
Adoption of New Accounting Pronouncements [Abstract]          
Classified distributions from equity method investees as cash flows from operating activities     202    
Cash flows from investing activities       (58)  
Cash flows from operating activities       $ 58  
ASU 2016-01 [Member]          
Adoption of New Accounting Pronouncements [Abstract]          
Cumulative effect adjustment that increased retained earnings and decreased AOCI         0
ASU 2016-01 [Member] | Retained Earnings [Member]          
Adoption of New Accounting Pronouncements [Abstract]          
Cumulative effect adjustment that increased retained earnings and decreased AOCI         9,825
ASU 2016-01 [Member] | Accumulated Other Comprehensive Income [Member]          
Adoption of New Accounting Pronouncements [Abstract]          
Cumulative effect adjustment that increased retained earnings and decreased AOCI         $ (9,825)
ASU 2014-09 [Member]          
Adoption of New Accounting Pronouncements [Abstract]          
Revenues within scope of updated accounting guidance     $ 57    
Revenues within scope of updated accounting guidance, as a percentage of total revenues (less than)     0.10%