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Equity - Treasury Stock Activity (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Equity, Class of Treasury Stock [Line Items]      
Value of shares withheld for taxes $ 6,373us-gaap_TreasuryStockValueAcquiredCostMethod $ 30,126us-gaap_TreasuryStockValueAcquiredCostMethod $ 11,312us-gaap_TreasuryStockValueAcquiredCostMethod
Value of shares retired 0us-gaap_TreasuryStockRetiredCostMethodAmount 0us-gaap_TreasuryStockRetiredCostMethodAmount 0us-gaap_TreasuryStockRetiredCostMethodAmount
Treasury Stock      
Equity, Class of Treasury Stock [Line Items]      
Number of shares withheld for taxes 1,034us-gaap_TreasuryStockSharesAcquired
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
5,679us-gaap_TreasuryStockSharesAcquired
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
1,547us-gaap_TreasuryStockSharesAcquired
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
Value of shares withheld for taxes 6,373us-gaap_TreasuryStockValueAcquiredCostMethod
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
30,126us-gaap_TreasuryStockValueAcquiredCostMethod
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
11,312us-gaap_TreasuryStockValueAcquiredCostMethod
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
Number of shares retired 1,034us-gaap_TreasuryStockSharesRetired
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
5,679us-gaap_TreasuryStockSharesRetired
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
1,547us-gaap_TreasuryStockSharesRetired
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
Value of shares retired $ 6,373us-gaap_TreasuryStockRetiredCostMethodAmount
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
$ 30,126us-gaap_TreasuryStockRetiredCostMethodAmount
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
$ 11,312us-gaap_TreasuryStockRetiredCostMethodAmount
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember