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Goodwill (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013
Goodwill [Line Items] |  |
Balance at beginning of period | $ 370,066 us-gaap_Goodwill | $ 240,314 us-gaap_Goodwill
Effect of foreign currency exchange rates | (16,426)us-gaap_GoodwillTranslationAdjustments | 1,178 us-gaap_GoodwillTranslationAdjustments
Goodwill acquired through acquisitions | 235,897 us-gaap_GoodwillPeriodIncreaseDecrease | 128,574 us-gaap_GoodwillPeriodIncreaseDecrease
Balance at end of period | 589,537 us-gaap_Goodwill | 370,066 us-gaap_Goodwill
Americas [Member] |  |
Goodwill [Line Items] |  |
Balance at beginning of period | 264,735 us-gaap_Goodwill / us-gaap_StatementGeographicalAxis = us-gaap_AmericasMember | 168,202 us-gaap_Goodwill / us-gaap_StatementGeographicalAxis = us-gaap_AmericasMember
Effect of foreign currency exchange rates | 1,804 us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementGeographicalAxis = us-gaap_AmericasMember |
Goodwill acquired through acquisitions | 72,872 us-gaap_GoodwillPeriodIncreaseDecrease / us-gaap_StatementGeographicalAxis = us-gaap_AmericasMember | 96,533 us-gaap_GoodwillPeriodIncreaseDecrease / us-gaap_StatementGeographicalAxis = us-gaap_AmericasMember
Balance at end of period | 339,411 us-gaap_Goodwill / us-gaap_StatementGeographicalAxis = us-gaap_AmericasMember | 264,735 us-gaap_Goodwill / us-gaap_StatementGeographicalAxis = us-gaap_AmericasMember
Europe [Member] |  |
Goodwill [Line Items] |  |
Balance at beginning of period | 71,155 us-gaap_Goodwill / us-gaap_StatementGeographicalAxis = us-gaap_EuropeMember | 40,276 us-gaap_Goodwill / us-gaap_StatementGeographicalAxis = us-gaap_EuropeMember
Effect of foreign currency exchange rates | (17,238)us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementGeographicalAxis = us-gaap_EuropeMember | 2,145 us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementGeographicalAxis = us-gaap_EuropeMember
Goodwill acquired through acquisitions | 163,025 us-gaap_GoodwillPeriodIncreaseDecrease / us-gaap_StatementGeographicalAxis = us-gaap_EuropeMember | 28,734 us-gaap_GoodwillPeriodIncreaseDecrease / us-gaap_StatementGeographicalAxis = us-gaap_EuropeMember
Balance at end of period | 216,942 us-gaap_Goodwill / us-gaap_StatementGeographicalAxis = us-gaap_EuropeMember | 71,155 us-gaap_Goodwill / us-gaap_StatementGeographicalAxis = us-gaap_EuropeMember
Asia Pacific [Member] |  |
Goodwill [Line Items] |  |
Balance at beginning of period | 34,176 us-gaap_Goodwill / us-gaap_StatementGeographicalAxis = us-gaap_AsiaPacificMember | 31,836 us-gaap_Goodwill / us-gaap_StatementGeographicalAxis = us-gaap_AsiaPacificMember
Effect of foreign currency exchange rates | (992)us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementGeographicalAxis = us-gaap_AsiaPacificMember | (967)us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementGeographicalAxis = us-gaap_AsiaPacificMember
Goodwill acquired through acquisitions |  | 3,307 us-gaap_GoodwillPeriodIncreaseDecrease / us-gaap_StatementGeographicalAxis = us-gaap_AsiaPacificMember
Balance at end of period | $ 33,184 us-gaap_Goodwill / us-gaap_StatementGeographicalAxis = us-gaap_AsiaPacificMember | $ 34,176 us-gaap_Goodwill / us-gaap_StatementGeographicalAxis = us-gaap_AsiaPacificMember

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