Fair Value Measurements (Details 3) - USD ($) $ in Thousands	Mar. 31, 2017		Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt and Capital Lease Obligations	$ 205,625		$ 198,857
Senior Notes due 2021 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt and Capital Lease Obligations	176,114	[1]	175,991	[2]
Senior Notes due 2021 [Member] | Portion at Other than Fair Value, Fair Value Disclosure [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of long-term debt	184,279	[1]	184,373	[2]
Senior Notes due 2021 [Member] | Fair Value, Inputs, Level 1 [Member] | Portion at Other than Fair Value, Fair Value Disclosure [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of long-term debt	0	[1]	0	[2]
Senior Notes due 2021 [Member] | Fair Value, Inputs, Level 2 [Member] | Portion at Other than Fair Value, Fair Value Disclosure [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of long-term debt	184,279	[1]	184,373	[2]
Senior Notes due 2021 [Member] | Fair Value, Inputs, Level 3 [Member] | Portion at Other than Fair Value, Fair Value Disclosure [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of long-term debt	$ 0	[1]	$ 0	[2]

[1] (1)Net of unamortized debt issuance costs and premium received of $1.9 million.

[2] (1)Net of unamortized debt issuance costs and premium received of $2.0 million.