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15. Quarterly Financial Data (unaudited)
12 Months Ended
Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]  
15. Quarterly Financial Data (unaudited)

   Quarter Ended 
   March 31,   June 30,   September 30,   December 31, 
    (In thousands, except per share data) 
2014                    
Revenues  $68,146   $71,594   $77,050   $83,467 
Income before income tax expense   11,764    12,329    13,804    14,346 
Net income   6,705    7,026    7,776    8,010 
Earnings per share:                    
Basic  $0.28   $0.28   $0.31   $0.31 
Diluted   0.21    0.22    0.24    0.25 
                     
2013                    
Revenues  $54,594   $70,482   $64,066   $66,634 
Income before income tax expense   6,528    8,546    10,559    11,540 
Net income   3,785    4,825    5,873    6,522 
Earnings per share:                    
Basic  $0.19   $0.23   $0.27   $0.28 
Diluted   0.12    0.15    0.19    0.21 
                     
2012                    
Revenues  $44,518   $44,151   $47,920   $50,620 
Income before income tax expense   512    1,341    2,728    4,607 
Net income   512    1,341    2,728    64,828 
Earnings per share:                    
Basic  $0.03   $0.07   $0.14   $3.30 
Diluted   0.02    0.05    0.11    2.20