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Debt Debt (Tables)
 12 Months Ended
Dec. 31, 2017
Schedule of Debt [Abstract]  
Schedule of Long-term Debt Instruments [Table Text Block]
Debt consists of the following (in thousands):
 
December 31,
2017
 
December 31,
2016
Convertible senior notes - unsecured (net of discount of $2,637 and $4,717)
$
144,938

 
$
195,283

Revolving credit facility - unsecured
221,000

 
158,000

Bank term loans - unsecured
250,000

 
250,000

Private placement term loans - unsecured
400,000

 
400,000

HUD mortgage loans (net of discount of $1,402 and $1,487)
43,645

 
44,354

Fannie Mae term loans - secured, non-recourse
96,367

 
78,084

Unamortized loan costs
(10,453
)
 
(9,740
)
 
$
1,145,497

 
$
1,115,981
Schedule of Maturities of Long-term Debt [Table Text Block]
Aggregate principal maturities of debt as of December 31, 2017 for each of the next five years and thereafter are as follows (in thousands):
Twelve months ended December 31,
 
2018
$
1,144

2019
1,188

2020
1,230

2021
148,854

2022
472,328

Thereafter
535,245

 
1,159,989

Less: discounts
(4,039
)
Less: unamortized loan costs
(10,453
)
 
$
1,145,497
Schedule of Unsecured Term Loans [Table Text Block]
Our unsecured private placement term loans are summarized below (in thousands):
Amount
 
Inception
 
Maturity
 
Fixed Rate
 
 
 
 
 
 
 
$
125,000

 
January 2015
 
January 2023
 
3.99%
50,000

 
November 2015
 
November 2023
 
3.99%
75,000

 
September 2016
 
September 2024
 
3.93%
50,000

 
November 2015
 
November 2025
 
4.33%
100,000

 
January 2015
 
January 2027
 
4.51%
$
400,000

 
 
 
 
 
 
Schedule of Interest Expense [Table Text Block]
 
Year Ended December 31,
 
2017
 
2016
 
2015
Interest expense on debt at contractual rates
$
40,385

 
$
36,197

 
$
30,094

Losses reclassified from accumulated other
 
 
 
 
 
comprehensive income into interest expense
2,627

 
3,928

 
4,497

Ineffective portion of cash flow hedges
(353
)
 
18

 
(18
)
Capitalized interest
(510
)
 
(549
)
 
(357
)
Charges taken on amending bank credit facility
583

 
—

 
—

Amortization of debt issuance costs and debt discount
3,592

 
3,514

 
3,413

Total interest expense
$
46,324

 
$
43,108

 
$
37,629
Schedule of Interest Rate Derivatives [Table Text Block]

Date Entered
 
Maturity Date
 
Fixed Rate
 
Rate Index
 
Notional Amount
 
Fair Value
May 2012
 
April 2019
 
2.84%
 
1-month LIBOR
 
$
40,000

 
$
159

June 2013
 
June 2020
 
3.41%
 
1-month LIBOR
 
$
80,000

 
$
(227
)
March 2014
 
June 2020
 
3.46%
 
1-month LIBOR
 
$
130,000

 
$
(520
)