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Long-Term Debt - Additional Information (Narrative) (Details) - USD ($)			3 Months Ended
	Apr. 15, 2014	Apr. 12, 2011	Mar. 31, 2017	Mar. 31, 2016	Apr. 15, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Debt Instrument, proceeds from sale of Asset Limit or Repurchase offer given			$ 15,000,000
Long-term debt			$ 149,473,000			$ 149,352,000
Senior Secured Notes
Debt Instrument [Line Items]
Interest rate			8.75%
Extinguishment of Debt, Amount	$ 50,000,000
Interest expense on note			$ 3,300,000
Interest paid on notes				$ 0
Private Placement | Senior Secured Notes
Debt Instrument [Line Items]
Private placement date		Apr. 12, 2011
Issuance of private placement, principal amount		$ 200,000,000.0
Interest rate		8.75%
Term of payments of interest on notes			semi-annually
Subsequent Event [Member] | The Notes [Member]
Debt Instrument [Line Items]
Debt instrument, repurchase amount					$ 30,000,000
Percent of principal amount to be repurchased					100.00%
Long-term debt					$ 120,000,000

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Interest paid long term debt.

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Reference 1: 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

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

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Aggregate amount of interest paid or due on all long-term debt.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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