Share-based Payments - Vesting Schedule (Details) - shares shares in Thousands	Sep. 30, 2016	Dec. 31, 2015
Time-based restricted stock awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Nonvested at the beginning of the period (in shares)	620
Performance-based restricted stock awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Nonvested at the beginning of the period (in shares)	1,440
Restricted stock awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Nonvested at the beginning of the period (in shares)	2,060	761