Fair Value Measurement - Fair Value of Assets (Liabilities) Not Measured at Fair Value In Consolidated Balance Sheets (Details) - USD ($) $ in Thousands		Dec. 31, 2016	Dec. 31, 2015
Debt Securities | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value	[1]	$ 0	$ 0
Debt Securities | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value	[1]	0	0
Debt Securities | Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value	[1]	20,519	22,226
Long-term Debt | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long term debt, fair value	[2]	0	0
Long-term Debt | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long term debt, fair value	[2]	(368,408)	(395,618)
Long-term Debt | Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long term debt, fair value	[2]	$ 0	$ 0

[1] The Perfect Home notes are carried at cost, which approximates fair value. The Company periodically reviews the carrying amount utilizing company-specific transactions or changes in Perfect Home's financial performance to determine if the notes are impaired.

[2] The fair value of fixed-rate long term debt is estimated using the present value of underlying cash flows discounted at a current market yield for similar instruments. The carrying amount of fixed-rate long term debt was $350.0 million and $375.0 million at December 31, 2016 and 2015, respectively.