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Stockholders' Equity (Details) - USD ($)
12 Months Ended
Feb. 02, 2018
Oct. 31, 2017
Aug. 02, 2017
May 04, 2017
Feb. 09, 2017
Nov. 01, 2016
Aug. 02, 2016
May 05, 2016
Feb. 10, 2016
Dec. 31, 2017
Dec. 31, 2016
Class of Stock [Line Items]                      
Preferred stock, par value (in dollars per share)                   $ 0.01 $ 0.01
Common stock, shares issued                   47,854,510 47,443,716
Stock Repurchased                   2,100,000  
Aggregate cost for repurchase of common stock                   $ 58,600,000  
Shares surrendered to pay exercise price or satisfy tax withholding obligations for stock options exercised/restricted stock                   117,076  
Dividend, declaration date   Oct. 31, 2017 Aug. 02, 2017 May 04, 2017 Feb. 09, 2017 Nov. 01, 2016 Aug. 02, 2016 May 05, 2016 Feb. 10, 2016    
Dividend amount to be paid, per common share (in dollars per share)   $ 0.3950 $ 0.3850 $ 0.3750 $ 0.3650 $ 0.3550 $ 0.3450 $ 0.3350 $ 0.3250    
Dividend, date of record   Nov. 17, 2017 Aug. 14, 2017 May 19, 2017 Feb. 22, 2017 Nov. 18, 2016 Aug. 17, 2016 May 18, 2016 Feb. 23, 2016    
Dividend, date to be paid   Dec. 05, 2017 Sep. 01, 2017 Jun. 02, 2017 Mar. 09, 2017 Dec. 05, 2016 Sep. 01, 2016 Jun. 02, 2016 Mar. 10, 2016    
Subsequent Event                      
Class of Stock [Line Items]                      
Dividend, declaration date Feb. 02, 2018                    
Dividend amount to be paid, per common share (in dollars per share) $ 0.4050                    
Dividend, date of record Feb. 22, 2018                    
Dividend, date to be paid Mar. 09, 2018                    
2012 Repurchase Program [Member]                      
Class of Stock [Line Items]                      
Maximum number of shares authorized to be repurchased                   5,000,000  
Stock Repurchase Program, Remaining Authorized Repurchase Amount                   $ 1,938,689  
IGC [Member]                      
Class of Stock [Line Items]                      
Stock Repurchased                     935,231