Annual report pursuant to Section 13 and 15(d)

Stock-Based Compensation - Stock Appreciation Rights (Details)

v3.7.0.1
Stock-Based Compensation - Stock Appreciation Rights (Details) - Stock Appreciation Rights - $ / shares
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Number of SAR’s      
Awards outstanding, beginning balance (in shares) 2,396,126 1,809,302 1,373,069
Granted (in shares) 176,824 655,855 449,225
Exercised (in shares) (8,003) (14,470) (435)
Forfeited (in shares) (56,932) (54,561) (12,557)
Awards outstanding, ending balance (in shares) 2,508,015 2,396,126 1,809,302
Number of SAR's - SAR's exercisable (in shares) 1,015,440    
Number of SAR's - SAR's expected to vest (in shares) 1,096,639    
Weighted Average Exercise Price (in dollars per share)      
SAR's outstanding - beginning balance (in dollars per share) $ 10.33 $ 10.63 $ 10.28
Granted (in dollars per share) 8.80 9.47 11.73
Exercised (in dollars per share) 8.57 9.21 7.37
Forfeited (in dollars per share) 10.75 10.30 11.57
SAR's outstanding - ending balance (in dollars per share) 10.22 $ 10.33 $ 10.63
Weighted Average Exercise Price - SAR's exercisable (in dollars per share) 15.92    
Weighted Average Exercise Price - SAR's expected to vest (in dollars per share) $ 10.19    
Weighted Average Contractual Term - SAR's outstanding 6 years 8 months 12 days 7 years 7 months 6 days 8 years 1 month 6 days
Weighted Average Contractual Term - SAR's expected to vest 6 years 8 months 12 days