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Stockholders' Equity (Details) - USD ($)
12 Months Ended
Feb. 06, 2019
Oct. 29, 2018
Aug. 08, 2018
May 03, 2018
Feb. 02, 2018
Oct. 31, 2017
Aug. 02, 2017
May 04, 2017
Feb. 09, 2017
Dec. 31, 2018
Dec. 31, 2016
Dec. 31, 2017
Class of Stock [Line Items]                        
Aggregate cost for repurchase of common stock                   $ 42,543,000    
Shares surrendered to pay exercise price or satisfy tax withholding obligations for stock options exercised/restricted stock                   52,912    
Dividend, declaration date   Oct. 29, 2018 Aug. 08, 2018 May 03, 2018 Feb. 02, 2018 Oct. 31, 2017 Aug. 02, 2017 May 04, 2017 Feb. 09, 2017      
Dividend amount to be paid, per common share (in dollars per share)   $ 0.4350 $ 0.4250 $ 0.4150 $ 0.4050 $ 0.3950 $ 0.3850 $ 0.3750 $ 0.3650      
Dividend, date of record   Nov. 19, 2018 Aug. 20, 2018 May 18, 2018 Feb. 22, 2018 Nov. 17, 2017 Aug. 14, 2017 May 19, 2017 Feb. 22, 2017      
Dividend, date to be paid   Dec. 05, 2018 Sep. 04, 2018 Jun. 01, 2018 Mar. 09, 2018 Dec. 05, 2017 Sep. 01, 2017 Jun. 02, 2017 Mar. 09, 2017      
Preferred stock, par value (in dollars per share)                   $ 0.01   $ 0.01
Common stock, shares issued                   48,082,800   47,854,510
Subsequent Event                        
Class of Stock [Line Items]                        
Dividend, declaration date Feb. 06, 2019                      
Dividend amount to be paid, per common share (in dollars per share) $ 0.4450                      
Dividend, date of record Feb. 25, 2019                      
Dividend, date to be paid Mar. 12, 2019                      
2012 Repurchase Program [Member]                        
Class of Stock [Line Items]                        
Maximum number of shares authorized to be repurchased                   5,000,000    
Stock Repurchased                   600,000    
Aggregate cost for repurchase of common stock                   $ 42,500,000    
Stock Repurchase Program, Remaining Authorized Repurchase Amount                   $ 1,338,689    
IGC [Member]                        
Class of Stock [Line Items]                        
Stock Repurchased                     935,231