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Equity - Outperformance Program (Details) (USD $)
6 Months Ended 12 Months Ended 6 Months Ended 12 Months Ended 0 Months Ended
Jun. 30, 2014
Dec. 31, 2013
Jun. 30, 2014
General and Administrative Expense
Jun. 30, 2013
General and Administrative Expense
Jun. 30, 2014
Deferred Leasing Costs and Lease Intatngibles, Net
Jun. 30, 2013
Deferred Leasing Costs and Lease Intatngibles, Net
Jun. 30, 2014
Additional Paid in Capital
Jun. 30, 2013
Additional Paid in Capital
Dec. 31, 2013
Additional Paid in Capital
Jan. 02, 2012
2012 Outperformance Program
Jan. 02, 2012
2012 Outperformance Program
The Company
Jan. 02, 2012
2012 Outperformance Program
SNL Equity REIT Index
Jan. 02, 2012
2012 Outperformance Program
Maximum
Jan. 02, 2012
2012 Outperformance Program
Minimum
Jan. 02, 2012
2012 Outperformance Program
Restricted Stock Units (RSUs)
Jan. 02, 2013
2013 Outperformance Program
Jan. 02, 2013
2013 Outperformance Program
The Company
Jan. 02, 2013
2013 Outperformance Program
SNL Equity REIT Index
Jan. 02, 2013
2013 Outperformance Program
Maximum
Jan. 02, 2013
2013 Outperformance Program
Minimum
Jan. 02, 2013
2013 Outperformance Program
Restricted Stock Units (RSUs)
Jan. 02, 2014
2014 Outperformance Program
Jan. 02, 2014
2014 Outperformance Program
The Company
Jan. 02, 2014
2014 Outperformance Program
SNL Equity REIT Index
Jan. 02, 2014
2014 Outperformance Program
Maximum
Jan. 02, 2014
2014 Outperformance Program
Minimum
Jan. 02, 2014
2014 Outperformance Program
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award                                                      
Maximum share value authorized under plan                   $ 10,000,000.0           $ 11,000,000           $ 12,000,000.0          
Performance period                   3 years           3 years           3 years          
Percentage Amount TSR Exceeds Simple Annual TSR                   4.00%           4.00%           4.00%          
Simple Annual TSR                   9.00%           9.00%           9.00%          
Percent TSR Exceeds SNL Equity REIT Index                   4.00%           4.00%           4.00%          
Absolute TSR Reduced on a Linear Basis                         100.00% 0.00%         100.00% 0.00%         100.00% 0.00%  
Simple TSR Reduced on a Linear Basis                         7.00% 0.00%         7.00% 0.00%         7.00% 0.00%  
Percent of Underperformance of SNL Equity REIT Index                   4.00%           4.00%           4.00%          
Underperformance of SNL Equity REIT Index per Year                   3.00%           3.00%           3.00%          
Hypothetical bonus pool for stock settled award                         4,000,000 2,000,000         4,000,000 2,000,000              
Award vesting period                             2 years           2 years           2 years
Stock settled awards                   3,490,000           4,140,000           3,210,000          
Forfeiture adjustment as percent of total cost                   6.00%           6.00%           10.00%          
Expected volatility rate                     36.00% 35.00%         33.00% 25.00%         28.00% 26.00%      
Risk free interest rate                   0.40%           0.38%           0.77%          
Expected dividend payment per share                   $ 1.62           $ 1.50           $ 1.50          
Amortization of stock-based compensation 3,451,000 6,682,000         3,451,000 3,623,000 6,682,000                                    
Allocated Share-based Compensation Expense     $ 3,255,000 $ 3,512,000 $ 196,000 $ 111,000