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Income Taxes - Reconciliation of effective tax rate (Details)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Reconciliation of effective tax rate      
Statutory tax rate (benefit) 35.00% 35.00% 35.00%
State taxes (benefit)-net of federal tax effect 6.00% 6.00% 6.00%
CRA investment tax credit (2.00%) (2.00%) (3.00%)
Other 0.00% 1.00% (1.00%)
Effective income tax rate, percent 39.00% 40.00% 37.00%