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Quarterly Financial Data - Unaudited (Tables)
12 Months Ended
Dec. 31, 2018
Quarterly Financial Data [Abstract]  
Quarterly Financial Data
2018 Q1 Q2 Q3 Q4 Total 
Total revenue $14,718 $18,204 $16,396 $16,160 $65,478 
Operating income (loss) 350 226 (44)106 638 
Net income (loss)
225 247 236 (282)426 
Net income (loss) per share - Basic 0.02 0.02 0.02 (0.02)0.03 
Net income (loss) per share - Diluted 0.02 0.02 0.02 (0.02)0.03 


2017 Q1 Q2 Q3 Q4 Total 
Total revenue $18,902 $16,218 $15,913 $16,660 $67,693 
Operating income 343 414 593 217 1,567 
Net income (1)
252 375 522 18,702 19,851 
Net income per share - Basic 0.02 0.03 0.04 1.46 1.55 
Net income per share - Diluted 0.02 0.03 0.04 1.42 1.51 

(1) The increase in fourth quarter net income is largely a result of the 2017 Tax Act, see Note 7.