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Equity - Narrative (Details) (USD $)
1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended 1 Months Ended 0 Months Ended 1 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended
Oct. 31, 2013
common_unit_holder
Dec. 31, 2012
common_unit_holder
Feb. 28, 2012
common_unit_holder
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Feb. 29, 2012
Oct. 31, 2013
Series A Cumulative Redeemable Preferred Units Of The Operating Partnership [Member]
Dec. 31, 2013
Series A Cumulative Redeemable Preferred Units Of The Operating Partnership [Member]
Oct. 30, 2013
Series A Cumulative Redeemable Preferred Units Of The Operating Partnership [Member]
Sep. 30, 2013
Series A Cumulative Redeemable Preferred Units Of The Operating Partnership [Member]
Dec. 31, 2013
Series B Preferred Stock [Member]
Dec. 31, 2012
Series B Preferred Stock [Member]
Feb. 12, 2013
Common Stock [Member]
May 03, 2012
Common Stock [Member]
Dec. 31, 2013
Common Stock [Member]
Dec. 31, 2012
Common Stock [Member]
Dec. 31, 2011
Common Stock [Member]
Dec. 31, 2012
At-the-Market [Member]
Dec. 31, 2013
Existing and Newly Elected Board Member [Member]
Dec. 31, 2013
Employees [Member]
Dec. 31, 2013
2012 Outperformance Program [Member]
Jan. 02, 2012
2012 Outperformance Program [Member]
Dec. 31, 2013
2012 Outperformance Program [Member]
Maximum [Member]
Dec. 31, 2013
2012 Outperformance Program [Member]
Minimum [Member]
Jan. 02, 2013
2013 Outperformance Program [Member]
Dec. 31, 2013
2013 Outperformance Program [Member]
Jan. 02, 2012
2013 Outperformance Program [Member]
Jan. 02, 2013
2013 Outperformance Program [Member]
Maximum [Member]
Dec. 31, 2013
2013 Outperformance Program [Member]
Maximum [Member]
Jan. 02, 2013
2013 Outperformance Program [Member]
Minimum [Member]
Dec. 31, 2013
2013 Outperformance Program [Member]
Minimum [Member]
Dec. 31, 2013
Change of Control [Member]
Series B Preferred Stock [Member]
Dec. 31, 2013
Pinnacle JV [Member]
building
sqft
Dec. 31, 2013
Pinnacle I [Member]
sqft
Dec. 31, 2012
Pinnacle I [Member]
sqft
Dec. 31, 2012
Pinnacle II [Member]
sqft
Jan. 23, 2012
Public Offering [Member]
Series B Preferred Stock [Member]
Dec. 31, 2010
Public Offering [Member]
Series B Preferred Stock [Member]
Feb. 12, 2013
Public Offering [Member]
Common Stock [Member]
May 18, 2012
Public Offering [Member]
Common Stock [Member]
Jan. 23, 2012
Public Offering, Exercise of Over-allotment Option [Member]
Series B Preferred Stock [Member]
Dec. 31, 2010
Public Offering, Exercise of Over-allotment Option [Member]
Series B Preferred Stock [Member]
Feb. 12, 2013
Public Offering, Exercise of Over-allotment Option [Member]
Common Stock [Member]
May 18, 2012
Public Offering, Exercise of Over-allotment Option [Member]
Common Stock [Member]
May 18, 2012
Private Placement [Member]
Common Stock [Member]
Dec. 31, 2013
General and Administrative Expense [Member]
Dec. 31, 2012
General and Administrative Expense [Member]
Dec. 31, 2013
Deferred Leasing Costs and Lease Intatngibles, Net [Member]
Dec. 31, 2012
Deferred Leasing Costs and Lease Intatngibles, Net [Member]
Dec. 31, 2013
Restricted Stock Units (RSUs) [Member]
2012 Outperformance Program [Member]
Jan. 02, 2013
Restricted Stock Units (RSUs) [Member]
2013 Outperformance Program [Member]
Dec. 31, 2013
The Company [Member]
2012 Outperformance Program [Member]
Dec. 31, 2013
The Company [Member]
2013 Outperformance Program [Member]
Dec. 31, 2013
SNL Equity REIT Index [Member]
2012 Outperformance Program [Member]
Dec. 31, 2013
SNL Equity REIT Index [Member]
2013 Outperformance Program [Member]
Class of Stock [Line Items]                                                                                                                
Noncontrolling interest, common units outstanding (in shares)       2,382,563     2,610,941                                                                                                  
Number of common unit holders 1 1 1                                                                                                          
Noncontrolling interest, decrease from redemptions or purchase of interests (in shares)   72,500 155,878         80,000                                                                                                
Number of buildings in property                                                                   2                                            
Area of real estate property                                                                   625,640                                            
Ownership interest in property                                                                   65.00% 98.25% 98.25%                                        
Business acquisition, area of real estate property (in sqft)                                                                     393,776 393,776 231,864                                      
Shares outstanding of preferred stock               419,014   499,014 419,014 5,800,000 5,800,000                                                                                      
Interest rate of preferred stock                 6.25%     8.375% 8.375%                                       12.375%                                              
Liquidation preference of preferred stock (dollars per share)               $ 25 $ 25.00     $ 25 $ 25                                                                                      
Par value of preferred stock                       $ 0.01 $ 0.01                                                                                      
Proceeds from sale of common stock (in shares)                                                                           2,300,000 3,500,000 8,000,000 13,225,000 300,000 300,000 1,200,000 1,725,000 2,000,000                    
Proceeds from the offering before transaction costs                                                                           $ 57,500,000 $ 83,900,000                                  
Liquidation preference of preferred stock, per annum (dollars per share)                       $ 2.0938                                         $ 3.09375                                              
Preferred stock, redemption period after change in control                       90 days                                                                                        
Public offering price (dollars per share)                                                                                 $ 15.00     $ 21.50                        
Proceeds from issuance of common stock       202,542,000 190,798,000 111,008,000               189,900,000 190,800,000                                                                                  
Value of shares authorized                                     125,000,000                                                                          
Value of shares issued         57,500,000                     202,542,000 190,798,000 111,008,000 12,600,000                                                                          
Conversion of convertible securities (in shares)   72,500 155,878                                                                                                          
Common dividends declared (dollars per share)       $ 0.5                                                                                                        
Preferred dividends declared (dollars per share)                 $ 1.5625     $ 2.09375                                                                                        
Award vesting period                                       3 years 3 years                                                           2 years 2 years        
Award hold post vesting period                                         2 years                                                                      
Maximum share value authorized under plan                                             10,000,000     11,000,000   11,000,000                                                        
Performance period                                           3 years       3 years 3 years                                                          
Percentage Amount TSR Exceeds Simple Annual TSR                                           4.00%         4.00%                                                          
Simple Annual TSR                                           9.00%         9.00%                                                          
Percent TSR Exceeds SNL Equity REIT Index                                           4.00%         4.00%                                                          
Absolute TSR Reduced on a Linear Basis                                               100.00% 0.00%         100.00%   0.00%                                                
Simple TSR Reduced on a Linear Basis                                               7.00% 0.00%         7.00% 0.00%                                                  
Percent of Underperformance of SNL Equity REIT Index                                           4.00%       4.00%                                                            
Underperformance of SNL Equity REIT Index per Year                                           3.00%       3.00%                                                            
Hypothetical bonus pool for stock settled award                                               4,000,000 2,000,000       4,000,000   2,000,000                                                  
Stock settled awards                                           3,490,000       4,140,000                                                            
Forfeiture adjustment as percent of total cost                                           6.00%         6.00%                                                          
Expected volatility rate                                                                                                         36.00% 33.00% 35.00% 25.00%
Risk free interest rate                                           0.40%         0.38%                                                          
Expected dividend payment per share                                           $ 1.62         $ 1.50                                                          
Non-cash compensation expense recognized as additional paid-in capital       6,682,000 4,314,000 2,660,000                                                                                                    
Share-based compensation expense                                                                                             $ 6,454,000 $ 4,212,000 $ 228,000 $ 102,000