|
Subesquent Events (Details) (USD $)
|
12 Months Ended | 0 Months Ended | 6 Months Ended | 0 Months Ended | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Dec. 31, 2013
item
property
|
Dec. 31, 2012
property
|
Dec. 31, 2011
|
Jan. 06, 2014
|
Jan. 04, 2013
|
Feb. 28, 2014
Subsequent Event [Member]
item
|
Feb. 28, 2014
Subsequent Event [Member]
L&B Group [Member]
|
Mar. 03, 2013
Subsequent Event [Member]
Messr Lefkowitz [Member]
|
Mar. 03, 2013
Subsequent Event [Member]
Messr Thomas [Member]
|
Sep. 30, 2014
Scenario, Forecast [Member]
Subsequent Event [Member]
Messr Thomas [Member]
|
Feb. 18, 2014
5.11% Senior Unsecured Notes [Member]
Subsequent Event [Member]
|
Feb. 24, 2014
Keystone Portfolio [Member]
Scenario, Forecast [Member]
property
|
|
| Subsequent Event [Line Items] | ||||||||||||
| Severance benefits | $ 3,400,000 | $ 3,100,000 | ||||||||||
| Stock options vested | 11,457 | 33,605 | ||||||||||
| Restricted stock units vested | 149,463 | 123,877 | 134,048 | 68,667 | 41,000 | |||||||
| Period for continuation of health insurance | 48 months | 48 months | ||||||||||
| Consulting payment | 300,000 | |||||||||||
| Common stock, shares outstanding | 88,247,591 | 87,536,292 | 87,928,002 | 87,537,250 | 477,300 | |||||||
| Percentage of noncontrolling interest | 11.90% | 12.20% | 0.50% | |||||||||
| Agreement termination period prior to specified notice period | 30 days | |||||||||||
| Number of board members | 10 | 11 | ||||||||||
| Repayments of senior unsecured notes | $ 100,000,000 | $ 221,019,000 | $ 200,000,000 | |||||||||
| Interest rate of senior unsecured notes | 5.11% | |||||||||||
| Number of properties sold | 24 | 4 | 15 | |||||||||