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Debt Debt (Tables) | 12 Months Ended
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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 | )

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- Definition Schedule of Unsecured Term Loans [Table Text Block] + References No definition available. + Details
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- Definition Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21475-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(e),(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21538-112644 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21506-112644 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28541-108399 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21521-112644 + Details
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- Definition Tabular disclosure of interest rate derivatives, including, but not limited to, the fair value of the derivatives, statement of financial position location, and statement of financial performance location of these instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 + Details
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- Definition Tabular disclosure of the combined aggregate amount of maturities and sinking fund requirements for all long-term borrowings for each of the five years following the date of the latest balance sheet date presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 + Details
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