Fair Value Measurements (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015
Recurring \| Total \| Sale leaseback obligation
Assets and Liabilities Measured at Fair Value
Sale leaseback obligation		$ 47,586
Recurring \| Total \| Money market funds
Assets and Liabilities Measured at Fair Value
Money market funds	$ 54,170	65,327
Recurring \| Level 1 \| Money market funds
Assets and Liabilities Measured at Fair Value
Money market funds	$ 54,170	65,327
Recurring \| Level 3 \| Sale leaseback obligation
Assets and Liabilities Measured at Fair Value
Sale leaseback obligation		$ 47,586
Land and buildings \| Beverly Property Owner LLC \| Sale leaseback obligation
Assets and Liabilities Measured at Fair Value
Implicit interest rate on associated cash flows	10.65%

Represents the information pertaining to implicit interest rate on the associated cash flows during the initial lease term.

No definition available.

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- Definition

Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Cash
-URI http://asc.fasb.org/extlink&oid=6506951

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Cash Equivalents
-URI http://asc.fasb.org/extlink&oid=6507016

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- Definition

Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13433-108611

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13476-108611

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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