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Real Estate Assets (Details) (USD $)
 12 Months Ended
Dec. 31, 2013
acre
Dec. 31, 2012
Dec. 31, 2011
Acquisitions [Abstract]      
Acquisition of development land (in acres) 600    
Business acquisition, contingent consideration at fair value   $ 563,000  
Gain on acquisition of controlling interest in unconsolidated affiliate 7,451,000 0 0
Acquisition-related costs 1,800,000 1,500,000  
Dispositions [Abstract]      
Gains/(losses) on disposition of discontinued operations 63,792,000 29,455,000 2,573,000
Gains/(losses) on disposition of property (3,000) 0 764,000
Atlanta, GA Office Properties Acquisition (9/2013) [Member]
      
Acquisitions [Abstract]      
Percentage of equity interest acquired in unconsolidated affiliate (in hundredths) 57.00%    
Number of office properties acquired 2    
Net rentable square feet of acquisition (in sqft) 505,000    
Purchase price of acquisition of unconsolidated affiliate 44,500,000    
Fair value of debt assumed from the acquisition 37,600,000    
Effective interest rate of secured debt assumed from the acquisition (in hundredths) 3.34%    
Maturity date of debt assumed from the acquisition Apr. 01, 2015    
Business Combination, Purchase Price Allocation [Abstract]      
Fair value of debt assumed from the acquisition (37,600,000)    
Nashville, TN Office Property Acquisition (9/2013) [Member]
      
Acquisitions [Abstract]      
Net rentable square feet of acquisition (in sqft) 520,000    
Acquisition purchase price 150,100,000    
Orlando, FL Office Properties Acquisition (9/2013) [Member]
      
Acquisitions [Abstract]      
Percentage of equity interest acquired in unconsolidated affiliate (in hundredths) 60.00%    
Number of office properties acquired 5    
Net rentable square feet of acquisition (in sqft) 1,300,000    
Purchase price of acquisition of unconsolidated affiliate 112,800,000    
Percentage of equity interest in joint venture, previously held (in hundredths) 40.00%    
Fair value of assets recorded from the acquisition 188,000,000    
Fair value of debt assumed from the acquisition 127,900,000    
Effective interest rate of secured debt assumed from the acquisition (in hundredths) 3.11%    
Maturity date of debt assumed from the acquisition Jul. 01, 2014    
Previously held equity interest remeasured at fair value 75,200,000    
Gain on acquisition of controlling interest in unconsolidated affiliate 7,500,000    
Business Combination, Purchase Price Allocation [Abstract]      
Fair value of debt assumed from the acquisition (127,900,000)    
Atlanta, GA Office Property Acquisition (6/2013) [Member]
      
Acquisitions [Abstract]      
Net rentable square feet of acquisition (in sqft) 553,000    
Acquisition purchase price 140,100,000    
Greensboro, NC Office Properties Acquisition (3/2013) [Member]
      
Acquisitions [Abstract]      
Number of office properties acquired 2    
Net rentable square feet of acquisition (in sqft) 195,000    
Acquisition purchase price 30,800,000    
Tampa, FL Office Properties Acquisition (3/2013) [Member]
      
Acquisitions [Abstract]      
Number of office properties acquired 2    
Net rentable square feet of acquisition (in sqft) 372,000    
Acquisition purchase price 52,500,000    
Memphis, TN Development Land Acquisition (3/2013) [Member]
      
Acquisitions [Abstract]      
Acquisition of development land (in acres) 5    
Acquisition purchase price 4,800,000    
Pro Forma 2013 Acquisitions [Member]
      
Acquisitions [Abstract]      
Fair value of debt assumed from the acquisition 127,891,000    
Business Combination, Purchase Price Allocation [Abstract]      
Real estate assets 445,396,000    
Acquisition-related intangible assets (in deferred financing and leasing costs) 50,595,000    
Fair value of debt assumed from the acquisition (127,891,000)    
Acquisition-related below market lease liabilities (in accounts payable, accrued expenses and other liabilities) (17,818,000)    
Total allocation 350,282,000    
Business Acquisition, Pro Forma Information [Abstract]      
Pro forma, rental and other revenues 593,778,000 541,092,000  
Pro forma, net income 121,754,000 69,111,000  
Pro forma, earnings per share - basic $ 1.33 $ 0.82  
Pro forma, earnings per share - diluted $ 1.33 $ 0.83  
Pro forma, assumption date of acquisition Jan. 01, 2012    
Revenues recorded due to acquisitions 25,000,000    
Net income/(loss) recorded due to acquisitions (200,000)    
Atlanta, GA Office Property Acquisition (2012) [Member]
      
Acquisitions [Abstract]      
Net rentable square feet of acquisition (in sqft)   492,000  
Acquisition purchase price   144,900,000  
Pittsburgh PA Office Property Acquisition (2012) [Member]
      
Acquisitions [Abstract]      
Net rentable square feet of acquisition (in sqft)   616,000  
Acquisition purchase price   91,200,000  
Greensboro, NC Medical Office Properties Acquisition (2012) [Member]
      
Acquisitions [Abstract]      
Number of office properties acquired   3  
Acquisition purchase price   29,600,000  
Common Units issued to acquire real estate assets (in shares)   66,864  
Business acquisition, contingent consideration at fair value   700,000  
Fair value of debt assumed from the acquisition   7,900,000  
Effective interest rate of secured debt assumed from the acquisition (in hundredths)   4.06%  
Maturity date of debt assumed from the acquisition   Aug. 01, 2014  
Business Combination, Purchase Price Allocation [Abstract]      
Fair value of debt assumed from the acquisition   (7,900,000)  
Nashville TN Development Land Acquisition (2012) [Member]
      
Acquisitions [Abstract]      
Acquisition of development land (in acres)   68  
Acquisition purchase price   15,000,000  
Square footage zoned for future development   1,300,000  
Cary, NC Office Property Acquisition (2012) [Member]
      
Acquisitions [Abstract]      
Net rentable square feet of acquisition (in sqft)   178,300  
Acquisition purchase price   26,000,000  
Pro Forma 2012 Acquisitions [Member]
      
Business Combination, Purchase Price Allocation [Abstract]      
Real estate assets   135,128,000  
Acquisition-related intangible assets (in deferred financing and leasing costs)   21,637,000  
Acquisition-related below market lease liabilities (in accounts payable, accrued expenses and other liabilities)   (11,875,000)  
Total allocation   144,890,000  
Business Acquisition, Pro Forma Information [Abstract]      
Pro forma, rental and other revenues   499,557,000 448,420,000
Pro forma, net income   84,135,000 44,817,000
Pro forma, earnings per share - basic   $ 1.02 $ 0.49
Pro forma, earnings per share - diluted   $ 1.01 $ 0.49
Pro forma, assumption date of acquisition   Jan. 01, 2011  
Atlanta GA Office Property Acquisition (2011) [Member]
      
Acquisitions [Abstract]      
Net rentable square feet of acquisition (in sqft)     503,000
Acquisition purchase price     78,300,000
Fair value of debt assumed from the acquisition     67,900,000
Effective interest rate of secured debt assumed from the acquisition (in hundredths)     5.45%
Maturity date of debt assumed from the acquisition     Jan. 01, 2014
Acquisition-related costs     300,000
Business Combination, Purchase Price Allocation [Abstract]      
Fair value of debt assumed from the acquisition     (67,900,000)
Pittsburgh PA Office Property Acquisition (2011) [Member]
      
Acquisitions [Abstract]      
Net rentable square feet of acquisition (in sqft)     1,540,000
Acquisition purchase price     188,500,000
Fair value of debt assumed from the acquisition     124,500,000
Effective interest rate of secured debt assumed from the acquisition (in hundredths)     4.27%
Maturity date of debt assumed from the acquisition     Nov. 01, 2017
Acquisition-related costs     4,000,000
Business Combination, Purchase Price Allocation [Abstract]      
Fair value of debt assumed from the acquisition     (124,500,000)
Raleigh NC Office Property Acquisition (2011) [Member]
      
Acquisitions [Abstract]      
Net rentable square feet of acquisition (in sqft)     48,000
Acquisition purchase price     8,900,000
Acquisition-related costs     100,000
Pro Forma 2011 Acquisitions [Member]
      
Business Combination, Purchase Price Allocation [Abstract]      
Real estate assets     241,602,000
Acquisition-related intangible assets (in deferred financing and leasing costs)     39,721,000
Furniture, fixtures and equipment (in prepaid expenses and other assets)     1,101,000
Acquisition-related below market lease liabilities (in accounts payable, accrued expenses and other liabilities)     (15,627,000)
Total allocation     266,797,000
Business Acquisition, Pro Forma Information [Abstract]      
Pro forma, rental and other revenues     473,584,000
Pro forma, net income     45,674,000
Pro forma, earnings per share - basic     $ 0.50
Pro forma, earnings per share - diluted     $ 0.50
Pro forma, assumption date of acquisition     Jan. 01, 2011
Greenville, SC Office Properties Disposition (12/2013) [Member]
      
Dispositions [Abstract]      
Number of office properties sold 8    
Proceeds received from the sale of real estate 57,900,000    
Closing credits for unfunded tenant improvements 100,000    
Closing credits for free rent 300,000    
Gains/(losses) on disposition of discontinued operations 3,100,000    
Tampa, FL Office Properties Disposition (12/2013) [Member]
      
Dispositions [Abstract]      
Proceeds received from the sale of real estate 11,500,000    
Closing credits for unfunded tenant improvements 600,000    
Gains/(losses) on disposition of discontinued operations 2,800,000    
Atlanta, GA Office Property Dispositon (10/2013) [Member]
      
Dispositions [Abstract]      
Proceeds received from the sale of real estate 13,800,000    
Gains/(losses) on disposition of discontinued operations 3,000,000    
Winston-Salem, NC Office Property Disposition 2 (10/2013) [Member]
      
Dispositions [Abstract]      
Proceeds received from the sale of real estate 5,300,000    
Gains/(losses) on disposition of discontinued operations 2,500,000    
Winston-Salem, NC Office Properties Disposition (9/2013) [Member]
      
Dispositions [Abstract]      
Number of office properties sold 4    
Proceeds received from the sale of real estate 6,200,000    
Gains/(losses) on disposition of discontinued operations 100,000    
Atlanta, GA Industrial Properties/Land Disposition (9/2013) [Member]
      
Dispositions [Abstract]      
Number of industrial properties sold 16    
Proceeds received from the sale of real estate 91,600,000    
Closing credits for unfunded tenant improvements 300,000    
Closing credits for free rent 300,000    
Gains/(losses) on disposition of discontinued operations 36,700,000    
Gains/(losses) on disposition of property 100,000    
Tampa, FL Office Property Disposition (9/2013) [Member]
      
Dispositions [Abstract]      
Proceeds received from the sale of real estate 11,600,000    
Gains/(losses) on disposition of discontinued operations 1,200,000    
Atlanta, GA Industrial Property Disposition (6/2013) [Member]
      
Dispositions [Abstract]      
Number of industrial properties sold 5    
Proceeds received from the sale of real estate 4,500,000    
Closing credits for free rent 100,000    
Gains/(losses) on disposition of discontinued operations 100,000    
Atlanta, GA Industrial Property/Land Disposition 2 (6/2013) [Member]
      
Dispositions [Abstract]      
Number of industrial properties sold 6    
Proceeds received from the sale of real estate 38,700,000    
Closing credits for unfunded tenant improvements 1,800,000    
Closing credits for free rent 1,300,000    
Gains/(losses) on disposition of discontinued operations 13,200,000    
Atlanta, GA Industrial Property Disposition 3 (6/2013) [Member]
      
Dispositions [Abstract]      
Number of industrial properties sold 2    
Proceeds received from the sale of real estate 4,800,000    
Gains/(losses) on disposition of discontinued operations (100,000)    
Orlando, FL Office Properties Disposition (3/2013) [Member]
      
Dispositions [Abstract]      
Number of office properties sold 2    
Proceeds received from the sale of real estate 14,600,000    
Closing credits for unfunded tenant improvements 800,000    
Gains/(losses) on disposition of discontinued operations (300,000)    
Atlanta GA and Jackson MS Office Properties Disposition (2012) [Member]
      
Dispositions [Abstract]      
Number of office properties sold   3  
Proceeds received from the sale of real estate   86,500,000  
Gains/(losses) on disposition of discontinued operations   14,000,000  
Gains/(losses) on disposition of property 1,500,000    
Additional purchase price consideration   1,500,000  
Nashville, TN Office Properties Disposition (2012) [Member]
      
Dispositions [Abstract]      
Number of office properties sold   5  
Proceeds received from the sale of real estate   41,000,000  
Gains/(losses) on disposition of discontinued operations   7,000,000  
Pinellas County, FL Office Property Disposition (2012) [Member]
      
Dispositions [Abstract]      
Proceeds received from the sale of real estate   9,500,000  
Gains/(losses) on disposition of discontinued operations   1,400,000  
Kansas City, MO Office Property Disposition (2012) [Member]
      
Dispositions [Abstract]      
Proceeds received from the sale of real estate   6,500,000  
Gains/(losses) on disposition of discontinued operations   1,900,000  
Kansas City, MO Rental Residential Disposition (2012) [Member]
      
Dispositions [Abstract]      
Residential units (in units)   96  
Proceeds received from the sale of real estate   11,000,000  
Gains/(losses) on disposition of discontinued operations   5,100,000  
Raleigh NC Residential Condominiums Disposition (2012) [Member]
      
Dispositions [Abstract]      
Residential units (in units)   17  
Proceeds received from the sale of real estate   5,500,000  
Gains/(losses) on disposition of discontinued operations   400,000  
Winston-Salem NC Disposition (2011) [Member]
      
Dispositions [Abstract]      
Proceeds received from the sale of real estate     15,000,000
Gains/(losses) on disposition of discontinued operations     2,600,000
Gains/(losses) on disposition of property     300,000
Winston-Salem, NC Office Properties (6/2013) [Member]
      
Impairments [Abstract]      
Number of impaired properties 4    
Impairments of real estate assets 1,100,000    
Atlanta, GA Industrial Properties (3/2013) [Member]
      
Impairments [Abstract]      
Number of impaired properties 7    
Impairments of real estate assets 1,100,000    
Orlando FL Office Property Impairment [Member]
      
Impairments [Abstract]      
Number of impaired properties     2
Impairments of real estate assets     $ 2,400,000