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Equity-Based Compensation Schedule of Performance Share Unit Transactions (Details) - Performance Share Units [Member]
12 Months Ended
Dec. 31, 2015
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]  
Unvested balance at beginning of period | shares 552,209
Shares granted | shares 234,085
Shares vested and paid out | shares (131,665)
Shares vested and canceled | shares (14,612)
Shares forfeited | shares (9,231)
Unvested balance at end of period | shares 630,786
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]  
Weighted average grant date fair value, beginning of period | $ / shares $ 30.85
Weighted average grant date fair value, grants | $ / shares 21.69
Weighted average grant date fair value, vested and paid out | $ / shares 30.77
Weighted average grant date fair value, vested and canceled | $ / shares 30.77
Weighted average grant date fair value, forfeited | $ / shares 29.19
Weighted average grant date fair value, end of period | $ / shares $ 27.50