Debt Debt (Tables)

12 Months Ended

Dec. 31, 2014

Schedule of Debt [Abstract]

Schedule of Long-term Debt Instruments [Table Text Block]

Debt consists of the following (in thousands):

	As of December 31,
	2014		2013
Convertible senior notes - unsecured (net of discount of $6,963)	$	193,037	$	—
Revolving credit facility - unsecured	374,000		167,000
Bank term loans - unsecured	250,000		370,000
HUD mortgage loans (net of discount of $1,662)	45,689		—
Fannie Mae term loans - secured (including premium of $1,756)	—		80,080
	$	862,726	$	617,080

Schedule of Interest Expense [Table Text Block]

The following table summarizes interest expense (in thousands):

	Year Ended December 31,
	2014			2013			2012
Interest expense at contractual rates	$	23,878		$	8,944		$	3,380
Capitalized interest	(576		)	(378		)	(208		)
Amortization of debt premiums, discounts and issuance costs	2,580			247			320
Unamortized premium written off as a result of debt payoff	(1,655		)	—			—
Debt issuance costs expensed due to credit facility modifications	2,145			416			—
Total interest expense	$	26,372		$	9,229		$	3,492

Schedule of Interest Rate Derivatives [Table Text Block]

December 31, 2014 (dollars in thousands):

Date Entered	Maturity Date	Fixed Rate	Rate Index	Notional Amount		Fair Value
May 2012	April 2019	3.29%	1-month LIBOR	$	40,000	$	(98	)
June 2013	June 2020	3.86%	1-month LIBOR	$	80,000	$	(1,814	)
March 2014	June 2020	3.91%	1-month LIBOR	$	130,000	$	(3,281	)