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Equity - Schedule of Share Based Compensation Activity (Details) - shares
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of Outstanding of Stock Options and SARs 747,573 718,143 664,245 788,748
Exercisable Number of Stock Options and SARs 543,698 548,180 483,216  
Vested or Expected to Vest Stock Options and SARs 736,851      
Weighted Average Remaining Contractual Life Stock Options and SARs Vested and Expected to Vest 8 years 2 months 12 days      
Outstanding Non-Vested Restricted Stock 132,651 103,772 98,285 91,311
$5.00 to $9.99 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of Outstanding of Stock Options and SARs 18,666      
Weighted Average Remaining Contractual Life Stock Options and SARs 3 years 3 months 24 days      
Exercisable Number of Stock Options and SARs 18,666      
Weighted Average Remaining Contractual Life Stock Options and SARs - Exercisable 3 years 3 months 24 days      
Vested or Expected to Vest Stock Options and SARs 18,666      
Weighted Average Remaining Contractual Life Stock Options and SARs Vested and Expected to Vest 3 years 3 months 24 days      
$10.00 to $14.99 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of Outstanding of Stock Options and SARs 66,665      
Weighted Average Remaining Contractual Life Stock Options and SARs 4 years 4 months 24 days      
Exercisable Number of Stock Options and SARs 66,665      
Weighted Average Remaining Contractual Life Stock Options and SARs - Exercisable 4 years 4 months 24 days      
Vested or Expected to Vest Stock Options and SARs 66,665      
Weighted Average Remaining Contractual Life Stock Options and SARs Vested and Expected to Vest 4 years 4 months 24 days      
$15.00 - $19.99 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of Outstanding of Stock Options and SARs 62,000      
Weighted Average Remaining Contractual Life Stock Options and SARs 5 years 4 months 24 days      
Exercisable Number of Stock Options and SARs 62,000      
Weighted Average Remaining Contractual Life Stock Options and SARs - Exercisable 5 years 4 months 24 days      
Vested or Expected to Vest Stock Options and SARs 62,000      
Weighted Average Remaining Contractual Life Stock Options and SARs Vested and Expected to Vest 5 years 4 months 24 days      
$20.00 to $24.99 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of Outstanding of Stock Options and SARs 100,500      
Weighted Average Remaining Contractual Life Stock Options and SARs 5 years 1 month 24 days      
Exercisable Number of Stock Options and SARs 100,500      
Weighted Average Remaining Contractual Life Stock Options and SARs - Exercisable 5 years 1 month 24 days      
Vested or Expected to Vest Stock Options and SARs 100,500      
Weighted Average Remaining Contractual Life Stock Options and SARs Vested and Expected to Vest 5 years 1 month 24 days      
$25.00 to $29.99 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of Outstanding of Stock Options and SARs 191,009      
Weighted Average Remaining Contractual Life Stock Options and SARs 1 year 11 months 6 days      
Exercisable Number of Stock Options and SARs 187,009      
Weighted Average Remaining Contractual Life Stock Options and SARs - Exercisable 1 year 8 months      
Vested or Expected to Vest Stock Options and SARs 190,809      
Weighted Average Remaining Contractual Life Stock Options and SARs Vested and Expected to Vest 1 year 11 months 6 days      
Outstanding Non-Vested Restricted Stock 6,778      
Weighted Average Remaining Contractual Life Outstanding Non-Vested Restricted Stock 2 years 1 month 12 days      
Weighted Average Remaining Contractual LIfe Expected to Vest Restricted Stock 2 years 1 month 12 days      
$30.00 to $34.99 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of Outstanding of Stock Options and SARs 250,733      
Weighted Average Remaining Contractual Life Stock Options and SARs 7 years 9 months 6 days      
Exercisable Number of Stock Options and SARs 90,864      
Weighted Average Remaining Contractual Life Stock Options and SARs - Exercisable 6 years 1 month 12 days      
Vested or Expected to Vest Stock Options and SARs 241,931      
Weighted Average Remaining Contractual Life Stock Options and SARs Vested and Expected to Vest 7 years 9 months 6 days      
Outstanding Non-Vested Restricted Stock 124,324      
Weighted Average Remaining Contractual Life Outstanding Non-Vested Restricted Stock 1 year 2 months 12 days      
Weighted Average Remaining Contractual LIfe Expected to Vest Restricted Stock 1 year 2 months 12 days      
$35.00 to $39.99 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of Outstanding of Stock Options and SARs 58,000      
Weighted Average Remaining Contractual Life Stock Options and SARs 8 years 2 months 12 days      
Exercisable Number of Stock Options and SARs 17,994      
Weighted Average Remaining Contractual Life Stock Options and SARs - Exercisable 8 years 3 months 12 days      
Vested or Expected to Vest Stock Options and SARs 56,280      
Outstanding Non-Vested Restricted Stock 1,549      
Weighted Average Remaining Contractual Life Outstanding Non-Vested Restricted Stock 1 year 2 months 18 days      
Weighted Average Remaining Contractual LIfe Expected to Vest Restricted Stock 1 year 2 months 18 days      
Expected to Vest [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Outstanding Non-Vested Restricted Stock 125,916      
Expected to Vest [Member] | $25.00 to $29.99 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Outstanding Non-Vested Restricted Stock 6,439      
Expected to Vest [Member] | $30.00 to $34.99 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Outstanding Non-Vested Restricted Stock 117,990      
Expected to Vest [Member] | $35.00 to $39.99 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Outstanding Non-Vested Restricted Stock 1,487