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Discontinued Operations - Income from Office Property Disposition and Held for Sale (Details) (USD $)
 3 Months Ended 6 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Dec. 31, 2013
Atrium at Stoneridge
Jun. 30, 2013
Atrium at Stoneridge
Dec. 31, 2013
Waterstone
Jun. 30, 2013
Waterstone
Dec. 31, 2013
Meridian
Jun. 30, 2013
Meridian
Dec. 31, 2013
Bank of America Plaza
Jun. 30, 2013
Bank of America Plaza
Dec. 31, 2013
Lakewood II
Jun. 30, 2013
Lakewood II
Dec. 31, 2013
Carmel Crossing
Jun. 30, 2013
Carmel Crossing
Dec. 31, 2013
2013 Dispositions
Jun. 30, 2013
2013 Dispositions
Jun. 30, 2014
Woodbranch Building
Jun. 30, 2014
Mesa Corporate Center
Jun. 30, 2014
2014 Dispositions
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                                            
Location           Columbia, SC   Atlanta, GA   Atlanta, GA   Nashville, TN   Atlanta, GA   Charlotte, NC       Houston, TX Phoenix, AZ  
Date of sale           Mar. 20, 2013   Jul. 10, 2013   Jul. 10, 2013   Jul. 17, 2013   Oct. 31, 2013   Nov. 08, 2013       Jan. 17, 2014 Jan. 31, 2014  
Net Sales Price             $ 2,966,000   $ 3,247,000   $ 6,615,000   $ 41,093,000   $ 10,240,000   $ 36,673,000   $ 100,834,000 $ 14,424,000 $ 12,257,000 $ 26,681,000
Real estate, net 2,508,323,000   2,508,323,000   2,316,795,000   2,424,000   3,207,000   6,560,000   29,643,000   4,403,000   22,104,000   68,341,000 4,450,000 11,768,000 16,218,000
Gain on sale of real estate from discontinued operations 0 0 10,463,000 542,000   542,000   40,000   55,000   11,450,000   5,837,000   14,569,000   32,493,000 [1]   9,974,000 489,000 10,463,000
Proportionate share of gain on sale of assets owned by joint venture                                   $ 18,200,000        
[1] Total gain on the sale of real estate in discontinued operations recognized for the year ended December 31, 2013 was $32.5 million, of which $18.2 million was the Company's proportionate share.