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Long-Term Incentive and Supplemental Executive Retirement Plans (Details) - shares
6 Months Ended 12 Months Ended
Jun. 30, 2015
Dec. 31, 2014
Dec. 31, 2013
Mar. 31, 2015
2015 LTIP        
Long-term incentive plan        
Threshold TSR percentile of the performance to earn half of the target amount of performance shares 50.00%      
Threshold percent of revenue growth over the long-term performance period to earn half of the target amount of performance shares 25.00%      
2015 LTIP | Maximum        
Long-term incentive plan        
TSR percentile level of the performance to earn zero percent of half of the target amount of performance shares 30.00%      
TSR percentile level of the performance to earn 200 percent of half of the target amount of performance shares 90.00%      
Percent of revenue growth over the long-term performance period to earn zero percent of half of the target amount of performance shares 15.00%      
Percent of revenue growth over the long-term performance period to earn to 200 percent of half of the target amount of performance shares 35.00%      
2015 LTIP | TSR at or below the 30 percentile level | Minimum        
Long-term incentive plan        
Percentage of target amount of performance shares earned by an executive officer 0.00%      
2015 LTIP | TSR at or above the 90 percentile level | Maximum        
Long-term incentive plan        
Percentage of target amount of performance shares earned by an executive officer 200.00%      
2015 LTIP | Revenue growth at or below 15 percent | Minimum        
Long-term incentive plan        
Percentage of target amount of performance shares earned by an executive officer 0.00%      
2015 LTIP | Revenue growth at or above 35 percent | Maximum        
Long-term incentive plan        
Percentage of target amount of performance shares earned by an executive officer 200.00%      
2015 LTIP | Performance share units        
Long-term incentive plan        
Number of performance share units approved under the plan       123,567
Long-term performance period 3 years      
2014 LTIP        
Long-term incentive plan        
Threshold TSR percentile of the performance to earn half of the target amount of performance shares   50.00%    
Threshold percent of revenue growth over the long-term performance period to earn half of the target amount of performance shares   30.00%    
2014 LTIP | Maximum        
Long-term incentive plan        
TSR percentile level of the performance to earn zero percent of half of the target amount of performance shares   30.00%    
TSR percentile level of the performance to earn 200 percent of half of the target amount of performance shares   90.00%    
Percent of revenue growth over the long-term performance period to earn zero percent of half of the target amount of performance shares   20.00%    
Percent of revenue growth over the long-term performance period to earn to 200 percent of half of the target amount of performance shares   40.00%    
2014 LTIP | TSR at or below the 30 percentile level | Minimum        
Long-term incentive plan        
Percentage of target amount of performance shares earned by an executive officer   0.00%    
2014 LTIP | TSR at or above the 90 percentile level | Maximum        
Long-term incentive plan        
Percentage of target amount of performance shares earned by an executive officer   200.00%    
2014 LTIP | Revenue growth at or below 20 percent | Minimum        
Long-term incentive plan        
Percentage of target amount of performance shares earned by an executive officer   0.00%    
2014 LTIP | Revenue growth at or above 40 percent | Maximum        
Long-term incentive plan        
Percentage of target amount of performance shares earned by an executive officer   200.00%    
2014 LTIP | Performance share units        
Long-term incentive plan        
Number of performance share units approved under the plan   141,566    
Long-term performance period   3 years    
2013 LTIP        
Long-term incentive plan        
Threshold TSR percentile of the performance to earn half of the target amount of performance shares     50.00%  
Threshold percent of revenue growth over the long-term performance period to earn half of the target amount of performance shares     60.00%  
2013 LTIP | Maximum        
Long-term incentive plan        
TSR percentile level of the performance to earn zero percent of half of the target amount of performance shares     30.00%  
TSR percentile level of the performance to earn 200 percent of half of the target amount of performance shares     90.00%  
Percent of revenue growth over the long-term performance period to earn zero percent of half of the target amount of performance shares     45.00%  
Percent of revenue growth over the long-term performance period to earn to 200 percent of half of the target amount of performance shares     75.00%  
2013 LTIP | TSR at or below the 30 percentile level | Minimum        
Long-term incentive plan        
Percentage of target amount of performance shares earned by an executive officer     0.00%  
2013 LTIP | TSR at or above the 90 percentile level | Maximum        
Long-term incentive plan        
Percentage of target amount of performance shares earned by an executive officer     200.00%  
2013 LTIP | Revenue growth at or below 45 percent | Minimum        
Long-term incentive plan        
Percentage of target amount of performance shares earned by an executive officer     0.00%  
2013 LTIP | Revenue growth at or above 75 percent | Maximum        
Long-term incentive plan        
Percentage of target amount of performance shares earned by an executive officer     200.00%  
2013 LTIP | Performance share units        
Long-term incentive plan        
Number of performance share units approved under the plan     135,332  
Long-term performance period     3 years