Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

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Amount of current revolving borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

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Number of Term Loans

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The carrying amount of the equity component of convertible debt which may be settled in cash upon conversion.

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The price per share of the conversion feature embedded in the debt instrument.

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Ratio applied to the conversion of debt instrument into equity with equity shares divided by debt principal amount.

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The number of equity instruments that the holder of the debt instrument would receive if the debt was converted to equity.

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Fixed interest rate related to the interest rate derivative.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of convertible debt securities using the if-converted method.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

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The interest rate applicable to the portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a set, unchanging rate.

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Amount of the contractual principal due at the origination of the mortgage loan (face amount).

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The number of real estate properties owned as of the balance sheet date.

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The cash outflow for loan and debt issuance costs.

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Debt (Narrative) (Details)	3 Months Ended		6 Months Ended
Debt (Narrative) (Details)	Jun. 30, 2016 USD ($) properties $ / shares shares	Jun. 30, 2015 shares	Jun. 30, 2016 USD ($) properties shares number_of_loans $ / shares	Jun. 30, 2015 USD ($) shares	Dec. 31, 2015 USD ($)	Mar. 31, 2014 USD ($)
Noncash or Part Noncash Acquisition, Value of Liabilities Assumed			$ 1,475,000	$ 1,112,000
Proceeds from convertible senior notes			200,000,000
Line of Credit Facility, Maximum Borrowing Capacity	$ 800,000,000		$ 800,000,000
Debt Instrument, Convertible, Conversion Ratio			14.050
Convertible Debt Instrument, Conversion Ratio, Principal Amount, Basis			$ 1,000
Debt Instrument, Convertible, Conversion Price \| $ / shares	$ 71.17		$ 71.17
Debt Instrument, Convertible, Number of Equity Instruments \| shares			2,810,065
Incremental Common Shares Attributable to Dilutive Effect of Conversion of Debt Securities \| shares	0	0	0	9,471
Weighted Average Number of Shares Outstanding, Diluted \| shares	38,561,384	37,607,117	38,488,088	37,626,192
Convertible Debt	$ 194,705,000		$ 194,705,000		$ 194,138,000	$ 192,238,000
Debt Instrument, Convertible, Carrying Amount of Equity Component						$ 7,762,000
Debt Instrument, Interest Rate, Effective Percentage	3.90%		3.90%
Unamortized Debt Issuance Expense	$ 10,652,000		$ 10,652,000		11,814,000
Debt Instrument, Variable Interest Rate, Reference Rate, Basis Points	4700.00%		4700.00%
Credit Facility, Current Revolving Borrowing Capacity	$ 550,000,000		$ 550,000,000
Credit Facility Expansion Amount	$ 250,000,000		$ 250,000,000
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage			4000.00%
Number of Real Estate Properties \| properties	194		194
Bank Term Loans [Member]
Unsecured Debt	$ 250,000,000		$ 250,000,000		250,000,000
8-Year AIG Private Placement Notes [Member]
Debt Instrument, Term			8 years
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate	3.99%		3.99%
Unsecured Debt	$ 50,000,000		$ 50,000,000
10-Year AIG Private Placement Notes [Member]
Debt Instrument, Term			10 years
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate	4.33%		4.33%
Unsecured Debt	$ 50,000,000		$ 50,000,000
Debt Instrument, Name, Convertible Senior Notes [Member]
Debt Instrument, Interest Rate, Stated Percentage	3.25%		3.25%
Payments of Financing Costs			$ 6,063,000
Unamortized Debt Issuance Expense	$ 3,696,000		$ 3,696,000
Debt Instrument, Name, Revolving Credit Facility [Member]
Debt Maturity, Extension Option, Number Of Years			1 year
Debt Instrument, Basis Spread on Variable Rate			15000.00%
Unused balance of the unsecured revolving credit facility	359,000,000		$ 359,000,000
Debt Instrument Name, $130m Term Loan - June 2020 Maturity [Member]
Term Loans, Outstanding Balance	130,000,000		$ 130,000,000
Debt Instrument, Basis Spread on Variable Rate			17500.00%
Debt Instrument Name, $120m Term Loans - June 2020 Maturity [Member]
Term Loans, Outstanding Balance	$ 120,000,000		$ 120,000,000
Debt Instrument, Basis Spread on Variable Rate			17500.00%
Number of Term Loans	2		2
Debt Instrument, Prior to Amendment [Member]
Line of Credit Facility, Maximum Borrowing Capacity	$ 700,000,000		$ 700,000,000
Debt Instrument, Name, Fannie Mae Term Loans [Member]
Debt Instrument, Term			10 years
Mortgage Loans on Real Estate, Face Amount of Mortgages	78,084,000		$ 78,084,000
Secured Debt	$ 78,084,000		$ 78,084,000		78,084,000
Debt Instrument, Interest Rate, Stated Percentage	3.79%		3.79%
Number of Real Estate Properties	13		13
Debt Instrument, Name, HUD Mortgages [Member]
Secured Debt	$ 44,698,000		$ 44,698,000		$ 45,035,000
Number of Real Estate Properties \| properties	10		10
Debt Instrument, Name, HUD Mortgages [Member] \| Minimum [Member]
Mortgage Loans on Real Estate, Interest Rate			4.30%
Debt Instrument, Name, HUD Mortgages [Member] \| Maximum [Member]
Mortgage Loans on Real Estate, Interest Rate			4.40%
Debt Instrument, HUD Mortgages, 2049 Maturity [Member]
Mortgage Loans on Real Estate, Number of Loans \| number_of_loans			9
8-Year Private Placement Notes [Member]
Debt Instrument, Term			8 years
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate	3.99%		3.99%
Unsecured Debt	$ 125,000,000		$ 125,000,000
12-Year Private Placement Notes [Member]
Debt Instrument, Term			12 years
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate	4.51%		4.51%
Unsecured Debt	$ 100,000,000		$ 100,000,000
Interest Rate Swap, Date Entered, March 2014 [Member]
Derivative, Fixed Interest Rate	3.91%		3.91%
Derivative, Notional Amount	$ 130,000,000		$ 130,000,000
Interest Rate Swap, Date Entered, May 2012 [Member]
Derivative, Fixed Interest Rate	3.29%		3.29%
Derivative, Notional Amount	$ 40,000,000		$ 40,000,000
Interest Rate Swap, Date Entered, June 2013 [Member]
Derivative, Fixed Interest Rate	3.86%		3.86%
Derivative, Notional Amount	$ 80,000,000		$ 80,000,000
Allocated to Debt [Member] \| Debt Instrument, Name, Convertible Senior Notes [Member]
Payments of Financing Costs			5,788,000
Allocated to Equity [Member] \| Debt Instrument, Name, Convertible Senior Notes [Member]
Payments of Financing Costs			$ 275,000
Debt Instrument, Interest Rate, Period, First Year [Member] \| Debt Instrument, Name, HUD Mortgages [Member] \| Minimum [Member]
Mortgage Loans on Real Estate, Interest Rate			4.65%
Debt Instrument, Interest Rate, Period, First Year [Member] \| Debt Instrument, Name, HUD Mortgages [Member] \| Maximum [Member]
Mortgage Loans on Real Estate, Interest Rate			4.75%
Middletown, OH [Member] \| Bickford Senior Living [Member]
Noncash or Part Noncash Acquisition, Value of Liabilities Assumed			$ 8,163,000
Noncash or Part Noncash Acquisition, Noncash Financial or Equity Instrument Consideration, Rate			2.90%
Noncash or Part Noncash Acquisition, Debt Assumed			$ 9,213,000