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Equity - Incentive and Share-based Compensation (Details)
$ / shares in Units, $ in Millions
1 Months Ended 12 Months Ended
Jun. 30, 2016
USD ($)
shares
Feb. 29, 2016
USD ($)
vesting_installment
shares
Jun. 30, 2015
USD ($)
shares
Feb. 28, 2015
USD ($)
vesting_installment
shares
Jan. 31, 2015
USD ($)
shares
Dec. 31, 2016
USD ($)
$ / shares
shares
Dec. 31, 2015
USD ($)
$ / shares
shares
Dec. 31, 2014
USD ($)
$ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Fair value of share-based awards granted in period | $             $ 0.1  
Period of service, upon completion of which, grantee's LTIP unit and restricted stock awards will immediately vest           10 years    
Expected volatility rate look-back period           6 years    
Share-based compensation arrangement by share-based payment award, equity instrument other than options, forfeitures rate           0.05    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]                
Unvested beginning balance, per share (USD per share) | $ / shares           $ 11.04    
Vested, weighted average grant price, per share (USD per share) | $ / shares           11.69    
Granted, weighted average grant price, per share (USD per share) | $ / shares           9.58    
Forfeited, weighted average grant price, per share (USD per share) | $ / shares           17.97    
Unvested ending balance, per share (USD per share) | $ / shares           $ 10.01 $ 11.04  
Age of grantee at which LTIP unit and restricted stock awards immediately vest           60 years    
Long-Term Incentive Plan Unit and Restricted Stock [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Fair value of share-based awards granted in period | $           $ 18.4 $ 6.6 $ 5.4
Expected term           2 years 9 months 18 days   3 years
Risk-free interest rate           0.84%   0.80%
Expected price volatility           24.00%   26.00%
Share-based compensation arrangement by share-based payment award, fair value assumptions, expected dividend rate           2.10% 1.90% 2.60%
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]                
Granted, weighted average grant price, per share (USD per share) | $ / shares           $ 9.60 $ 13.36 $ 10.65
Long-Term Incentive Plan Unit and Restricted Stock [Member] | Maximum [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Expected term             3 years  
Risk-free interest rate             1.00%  
Expected price volatility             29.00%  
Long-Term Incentive Plan Unit and Restricted Stock [Member] | Minimum [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Expected term             2 years 10 months 24 days  
Risk-free interest rate             0.80%  
Expected price volatility             24.00%  
Time Based Long-Tern Incentive Plan Unit [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Fair value of share-based awards granted in period | $   $ 1.4   $ 0.8   $ 0.1    
Award vesting period   4 years   4 years        
Number of vesting installments (vesting_installment) | vesting_installment   3   3        
Restricted Stock and LTIP Unit Activity [Roll Forward]                
Granted (in shares)   47,168   33,398        
Performance Based Long-Term Incentive Plan Unit [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Fair value of share-based awards granted in period | $   $ 0.8   $ 0.4        
Award vesting period   3 years   3 years        
Number of vesting installments (vesting_installment) | vesting_installment   2   2        
Restricted Stock and LTIP Unit Activity [Roll Forward]                
Granted (in shares)   112,925   33,398        
Long-Term Incentive Plan Unit [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]                
Fair value vested in period | $           $ 5.1 $ 3.5 $ 3.0
Time Restricted Shares [Member]                
Restricted Stock and LTIP Unit Activity [Roll Forward]                
Granted (in shares)   44,198   14,315        
Performance Restricted Shares [Member]                
Restricted Stock and LTIP Unit Activity [Roll Forward]                
Granted (in shares)       14,315        
Restricted Stock [Member]                
Restricted Stock and LTIP Unit Activity [Roll Forward]                
Unvested beginning balance (in shares)           97,592    
Vested (in shares)           (36,592)    
Granted (in shares)           47,071    
Forfeited (in shares)           (278)    
Unvested ending balance (in shares)           107,793 97,592  
Long-Term Incentive Plan Unit [Member]                
Restricted Stock and LTIP Unit Activity [Roll Forward]                
Unvested beginning balance (in shares)           1,415,895    
Vested (in shares)           (402,895)    
Granted (in shares)           1,868,629    
Forfeited (in shares)           0    
Unvested ending balance (in shares)           2,881,629 1,415,895  
Awards that Meet Age and Service Requirements for Vesting [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]                
Noncash share-based compensation expense recognized | $           $ 0.7 $ 0.5 0.2
Unrecognized compensation expense | $           $ 0.4    
Unrecognized compensation expense, period for recognition (in years)           1 year 10 months 24 days    
Awards that Do Not Meet Age and Service Requirements for Vesting [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]                
Noncash share-based compensation expense recognized | $           $ 9.0 $ 5.0 $ 3.5
Unrecognized compensation expense | $           $ 18.5    
Unrecognized compensation expense, period for recognition (in years)           2 years 4 months 18 days    
Director [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Share-based compensation arrangement by share-based payment award, equity instrument other than options, forfeitures rate           0    
Director [Member] | 2013 Plan Units Vesting June 2019 [Member] | Time Based Long-Tern Incentive Plan Unit [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Fair value of share-based awards granted in period | $ $ 0.8              
Award vesting period 3 years              
Restricted Stock and LTIP Unit Activity [Roll Forward]                
Granted (in shares) 43,257              
Director [Member] | 2013 Plan Units Vesting February 2018 [Member] | Time Based Long-Tern Incentive Plan Unit [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Fair value of share-based awards granted in period | $     $ 0.6          
Award vesting period     3 years          
Restricted Stock and LTIP Unit Activity [Roll Forward]                
Granted (in shares)     35,082          
Executive Officer [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Share-based compensation arrangement by share-based payment award, equity instrument other than options, forfeitures rate           0    
Executive Officer [Member] | 2013 Plan Units Vesting February 2020 [Member] | Time Based Long-Tern Incentive Plan Unit [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Fair value of share-based awards granted in period | $   $ 5.6            
Award vesting period   4 years            
Number of vesting installments (vesting_installment) | vesting_installment   3            
Restricted Stock and LTIP Unit Activity [Roll Forward]                
Granted (in shares)   368,225            
Executive Officer [Member] | 2013 Plan Units Vesting February 2020 [Member] | Performance Based Long-Term Incentive Plan Unit [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Fair value of share-based awards granted in period | $   $ 8.8            
Award vesting period   3 years            
Number of vesting installments (vesting_installment) | vesting_installment   2            
Restricted Stock and LTIP Unit Activity [Roll Forward]                
Granted (in shares)   1,230,228            
Executive Officer [Member] | 2013 Plan Units Vesting February 2021 [Member] | Time Based Long-Tern Incentive Plan Unit [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Fair value of share-based awards granted in period | $   $ 1.0            
Award vesting percentage after three years           30.00%    
Award vesting percentage after four years           30.00%    
Award vesting percentage after five years           40.00%    
Restricted Stock and LTIP Unit Activity [Roll Forward]                
Granted (in shares)   62,814            
Executive Officer [Member] | 2013 Plan Units Vesting February 2018 [Member] | Time Based Long-Tern Incentive Plan Unit [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Fair value of share-based awards granted in period | $       $ 0.2        
Award vesting period       4 years        
Number of vesting installments (vesting_installment) | vesting_installment       3        
Restricted Stock and LTIP Unit Activity [Roll Forward]                
Granted (in shares)       13,736        
Executive Officer [Member] | 2013 Plan Units Vesting February 2018 [Member] | Performance Based Long-Term Incentive Plan Unit [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Fair value of share-based awards granted in period | $       $ 0.1        
Award vesting period       3 years        
Number of vesting installments (vesting_installment) | vesting_installment       2        
Restricted Stock and LTIP Unit Activity [Roll Forward]                
Granted (in shares)       13,736        
Executive Officer [Member] | 2013 Plan Units Vesting January 2018 [Member] | Time Based Long-Tern Incentive Plan Unit [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Fair value of share-based awards granted in period | $       $ 2.9        
Award vesting period       4 years        
Number of vesting installments (vesting_installment) | vesting_installment       3        
Restricted Stock and LTIP Unit Activity [Roll Forward]                
Granted (in shares)       168,033        
Executive Officer [Member] | 2013 Plan Units Vesting January 2018 [Member] | Performance Based Long-Term Incentive Plan Unit [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Fair value of share-based awards granted in period | $       $ 1.3        
Award vesting period       3 years        
Number of vesting installments (vesting_installment) | vesting_installment       2        
Restricted Stock and LTIP Unit Activity [Roll Forward]                
Granted (in shares)       154,266        
Employee [Member] | Time Based Long-Tern Incentive Plan Unit [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Fair value of share-based awards granted in period | $         $ 0.2      
Restricted Stock and LTIP Unit Activity [Roll Forward]                
Granted (in shares)         9,531      
2013 Plan [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Number of shares authorized under the plan (shares)           12,200,000    
Number of shares that remain available for future issuance (shares)           8,300,000