Long-term Compensation Plans - Activity in Payment Awards (Details)	9 Months Ended
	Sep. 30, 2017 shares
Total
Beginning balance (in shares)	3,003,003
Granted (in shares)	1,356,683
Exercised (in shares)	(104,625)
Forfeited (in shares)	(393,128)
Ending balance (in shares)	3,861,933
Stock Options
Beginning balance (in shares)	565,198
Granted (in shares)	256,202
Exercised (in shares)	0
Forfeited (in shares)	(73,884)
Ending balance (in shares)	747,516
RSUs
Equity Classified
Beginning balance (in shares)	2,117,493
Granted (in shares)	1,100,481
Exercised (in shares)	(104,625)
Forfeited (in shares)	(318,610)
Ending balance (in shares)	2,794,739
Liability Classified
Outstanding, beginning balance (in shares)	320,312
Forfeited (in shares)	(634)
Outstanding, ending balance (in shares)	319,678