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Derivatives (Details) (USD $)
 3 Months Ended 9 Months Ended 9 Months Ended 9 Months Ended 9 Months Ended 9 Months Ended 9 Months Ended 9 Months Ended 9 Months Ended 9 Months Ended 9 Months Ended 9 Months Ended 9 Months Ended 9 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Assets [Member]
Sep. 30, 2014
.76% Derivative [Member]
Dec. 31, 2013
.76% Derivative [Member]
Sep. 30, 2014
Derivative @ 2.196% 28.1K [Member]
Dec. 31, 2013
Derivative @ 2.196% 28.1K [Member]
Sep. 30, 2014
Derivative B @ 2.479% 50K [Member] [Member]
Dec. 31, 2013
Derivative B @ 2.479% 50K [Member] [Member]
Sep. 30, 2014
Derivative @ 2.873% 35K [Member]
Dec. 31, 2013
Derivative @ 2.873% 35K [Member]
Sep. 30, 2014
Derivative @ 2.864% 60K [Member]
Dec. 31, 2013
Derivative @ 2.864% 60K [Member]
Sep. 30, 2014
Derivative @ 2.087% 75K [Member]
Dec. 31, 2013
Derivative @ 2.087% 75K [Member]
Sep. 30, 2014
Derivative @ 2.088% 50K [Member]
Dec. 31, 2013
Derivative @ 2.088% 50K [Member]
Sep. 30, 2014
Derivative @ 2.479% 75K [Member]
Dec. 31, 2013
Derivative @ 2.479% 75K [Member]
Sep. 30, 2014
Derivative A @ 2.479% 50K [Member]
Dec. 31, 2013
Derivative A @ 2.479% 50K [Member]
Sep. 30, 2014
Derivative @ 3.41% 45K [Member] [Member]
Dec. 31, 2013
Derivative @ 3.41% 45K [Member] [Member]
Sep. 30, 2014
Derivative @ 3.488% 20K [Member]
Dec. 31, 2013
Derivative @ 3.488% 20K [Member]
Sep. 30, 2014
Derivative @ 3.48% 100K [Member]
Dec. 31, 2013
Derivative @ 3.48% 100K [Member]
Sep. 30, 2014
Swap [Member]
Sep. 30, 2014
Derivative @ 3.48% 100K 2 [Member]
Dec. 31, 2013
Derivative @ 3.48% 100K 2 [Member]
Sep. 30, 2014
Fair Value, Inputs, Level 2 [Member]
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 2 [Member]
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 2 [Member]
Fair Value, Measurements, Recurring [Member]
.76% Derivative [Member]
May 26, 2014
3.75% unsecured maturing 6/15/24 [Member]
Unsecured Debt [Member]
Sep. 30, 2014
2015 Debt Issuance [Member]
Derivative [Member]
Sep. 30, 2014
2017 Debt issuance [Member]
Derivative [Member]
Derivative [Line Items]                                                                            
Derivative Instruments, Gain (Loss) [Table Text Block]    
Derivatives in FASB
ASC Topic 815 Cash
Flow Hedging
Relationships:
Amount of Gain (Loss)
Recognized in OCI on
Derivative (Effective
Portion)
 
Location and Amount of Gain
(Loss) Reclassified
from Accumulated
OCI into Income
(Effective Portion)
 
Location and Amount of Gain or
(Loss) Recognized in
Income on  Derivative
(Ineffective Portion and
Amount Excluded from
Effectiveness Testing)
 
Three months ended September 30,
 
 
 
Three months ended September 30,
 
 
 
Three months ended September 30,
 
2014
 
2013
 
 
 
2014
 
2013
 
 
 
2014
 
2013
Interest rate swaps
$
(3,651
)
 
521

 
Interest
expense
 
$
(2,217
)
 
(2,366
)
 
Other expenses
 
$
—

 
—




Derivatives in FASB
ASC Topic 815 Cash
Flow Hedging
Relationships:
Amount of Gain (Loss)
Recognized in OCI on
Derivative (Effective
Portion)
 
Location and Amount of Gain
(Loss) Reclassified
from Accumulated
OCI into Income
(Effective Portion)
 
Location and Amount of Gain or
(Loss) Recognized in
Income on  Derivative
(Ineffective Portion and
Amount Excluded from
Effectiveness Testing)
 
Nine months ended September 30,
 
 
 
Nine months ended September 30,
 
 
 
Nine months ended September 30,
 
2014
 
2013
 
 
 
2014
 
2013
 
 
 
2014
 
2013
Interest rate swaps
$
(28,603
)
 
22,225

 
Interest
expense
 
$
(6,966
)
 
(7,098
)
 
Other expenses
 
$
—

 
(3
)
                                                                      
Document Period End Date     Sep. 30, 2014                                                                      
Debt Instrument, Face Amount                                                                       $ 250,000,000    
Debt Instrument, Interest Rate, Stated Percentage                                                                       3.75%    
Net cash proceeds from settlement of derivatives                                                                       4,600,000    
Debt Instrument, Interest Rate, Effective Percentage                                                                       0.00%    
Document Fiscal Year Focus     2014                                                                      
Derivative, Inception Date           Oct. 01, 2011   Oct. 16, 2013   Aug. 01, 2015   Apr. 15, 2014   Apr. 15, 2014   Apr. 15, 2014   Apr. 15, 2014   Aug. 01, 2015   Aug. 01, 2015   Aug. 01, 2015   Jun. 15, 2017   Jun. 15, 2017     Jun. 15, 2017              
Derivative, Maturity Date           Sep. 01, 2014   Oct. 16, 2020   Aug. 01, 2025   Apr. 15, 2024   Apr. 15, 2024   Apr. 15, 2024   Apr. 15, 2024   Aug. 01, 2025   Aug. 01, 2025   Aug. 01, 2025   Jun. 15, 2027   Jun. 15, 2027     Jun. 15, 2027              
Derivative, Early Termination Date                   Feb. 01, 2016 [1]   Oct. 15, 2014 [1]   Oct. 15, 2014 [1]   Oct. 15, 2014 [1]   Oct. 15, 2014 [1]   Feb. 01, 2016 [1]   Feb. 01, 2016 [1]   Feb. 01, 2016 [1]   Dec. 15, 2017 [1]   Dec. 15, 2017 [1]     Dec. 15, 2017 [1]              
Derivative, Notional Amount         220,000,000 9,000,000   28,100,000   50,000,000   35,000,000   60,000,000   75,000,000   50,000,000   75,000,000   50,000,000   45,000,000   20,000,000   100,000,000     100,000,000              
Derivative, Description of Variable Rate Basis           1 Month LIBOR   1 Month LIBOR   3 Month LIBOR   3 Month LIBOR   3 Month LIBOR   3 Month LIBOR   3 Month LIBOR   3 Month LIBOR   3 Month LIBOR   3 Month LIBOR   3 Month LIBOR   3 Month LIBOR     3 Month LIBOR              
Derivative, Fixed Interest Rate           0.76%   2.196%   2.479%   2.8725%   2.864%   2.087%   2.088%   2.479%   2.479%   3.4115%   3.4875%   3.48%     3.48%              
Derivative, Fixed Interest Rate                                                                         2.67% 3.48%
Derivative Asset, Fair Value, Gross Asset           0 [2] 0 [2] 0 [2] (82,000) [2] (1,973,000) [2] (5,658,000) [2] 0 [2] (1,036,000) [2] 0 [2] (1,821,000) [2] 0 [2] (7,476,000) [2] 0 [2] (4,978,000) [2] (2,959,000) [2] (8,516,000) [2] (1,973,000) [2] (5,670,000) [2] 0 [2] 0 [2] 0 [2] 0 [2] 0 [2] 0 [2]   0 [2] 0 [2] (6,905,000) [2] (35,237,000) [2]        
Derivative Liability, Fair Value, Gross Liability           0 [2]   (395,000) [2] 0 [2] 0 [2] 0 [2] 0 [2] 0 [2] 0 [2] 0 [2] 0 [2] 0 [2] 0 [2] 0 [2] 0 [2] 0 [2] 0 [2] 0 [2] (1,929,000) [2] 0 [2] (204,000) [2] 0 [2] (973,000) [2] 0 [2]   (982,000) [2] 0 [2] 4,483,000 [2] 34,000 [2] 34,000 [2]      
Effective portion of change in fair value of derivative instruments (3,651,000) 521,000 (28,603,000) 22,225,000                                                                    
Amount reclassified from accumulated other comprehensive loss (2,217,000) (2,366,000) (6,966,000) (7,098,000)                                                                    
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net 0 0 0 (3,000)                                                                    
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months     $ 8,700,000                                                     $ 8,200,000                
[1] Represents the date specified in the agreement for either optional or mandatory early termination which will result in cash settlement.
[2] The Company issued $250 million of 3.75%, fixed rate ten year unsecured bonds in May 2014. Prior to issuing the bonds, the Company locked in the ten year treasury rate using forward starting interest rate swaps to mitigate the risk of interest rates rising. In connection with the issuance of the new bonds, the Company terminated and settled these swaps, resulting in net cash proceeds of $4.6 million. These proceeds will offset bond interest expense over the life of the bonds, resulting in a lower effective interest rate of 3.59%.