Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Accounts receivable, allowance (in dollars)	$ 0	$ 0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	245,000,000us-gaap_CommonStockSharesAuthorized	245,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued	65,988,561us-gaap_CommonStockSharesIssued	63,013,192us-gaap_CommonStockSharesIssued
Common stock, shares outstanding	47,107,709us-gaap_CommonStockSharesOutstanding	50,388,140us-gaap_CommonStockSharesOutstanding
Treasury stock, shares	18,880,852us-gaap_TreasuryStockShares	12,625,052us-gaap_TreasuryStockShares
Preferred stock
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized	10,000,000	10,000,000
Preferred stock, shares issued	0	0
Series A junior participating preferred stock
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized	100,000	100,000
Preferred stock, shares issued	0	0

A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible.

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