Accounts Receivable and Other Receivables (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable, Gross	$ 41,707	$ 52,660
Less: allowance for doubtful accounts	(348)	(779)
Accounts Receivable, Net	41,359	51,881
Allowance for Doubtful Accounts Receivable [Roll Forward]
Allowance for Doubtful Accounts Receivable	779	828	933
Allowance for Doubtful Accounts Receivable, Charge-offs	(310)	0	51
Allowance for Doubtful Accounts Receivable, Recoveries	(121)	(49)	(156)
Allowance for Doubtful Accounts Receivable	348	779	828
Other receivables	$ 2,634	$ 2,394