XML 86 R72.htm IDEA: XBRL DOCUMENT v3.3.1.900
CAPITAL STOCK, Employee Stock Purchase Plan (Details) - $ / shares
4 Months Ended 12 Months Ended
Apr. 30, 2008
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Employee Stock Purchase Plan [Abstract]        
Employee purchase price, percent of market value 85.00%      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant   2,213,283    
Employee Stock Purchase Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant   343,613    
Weighted-average assumptions and fair value of shares issued under the ESPP        
Expected dividend yield (in hundredths)   0.00% 0.00% 0.00%
Risk-free interest rate (in hundredths)   0.03% 0.09% 0.09%
Expected volatility (in hundredths)   37.00% 35.00% 51.00%
Expected life (in years)   88 days 62 days 91 days
Weighted-average fair value of shares issued (in dollars per share)   $ 2.15 $ 2.02 $ 1.00
Shares issued under the ESPP (in shares)   98,300 0 27,936
Average price of shares issued (in dollars per share)   $ 10.17 $ 0.00 $ 6.29