SCHEDULE II. VALUATION AND QUALIFYING ACCOUNTS (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Allowance for Doubtful Accounts
Movement in Valuation Allowances and Reserves [Roll Forward]
Valuation allowances, beginning balance	$ 5,631		$ 3,274		$ 2,047
Valuation allowances, Charged to Expenses	16,257		2,549		3,049
Valuation allowances, Charged to Other Accounts	1,399	[1],[2]	0	[1],[2]	0	[1],[2]
Valuation allowances, Deductions	612	[3],[4]	192	[3],[4]	1,822	[3],[4]
Valuation allowances, ending balance	22,675		5,631		3,274
Valuation Allowance of Deferred Tax Assets
Movement in Valuation Allowances and Reserves [Roll Forward]
Valuation allowances, beginning balance	3,189		2,413		2,209
Valuation allowances, Charged to Expenses	0		0		0
Valuation allowances, Charged to Other Accounts	0	[1],[2]	776	[1],[2]	204	[1],[2]
Valuation allowances, Deductions	74	[3],[4]	0	[3],[4]	0	[3],[4]
Valuation allowances, ending balance	$ 3,115		$ 3,189		$ 2,413

[1] Allowance for doubtful accounts primarily includes amounts previously written off which were credited directly to this account when recovered.

[2] Valuation allowance for deferred tax assets includes current year increase to valuation allowance charged to equity and reclassifications from other balance sheet accounts.

[3] Reductions to valuation allowances related to deferred tax assets.

[4] Amounts written off as uncollectible or transferred to other accounts or utilized.